The incident came days after three people were killed in a knife attack at a church in the the southern French city of Nice.
The incident came days after three people were killed in a knife attack at a church in the southern French city of Nice, in what French President Emmanuel Macron said was an "Islamist terrorist attack".
The death toll for Friday's earthquake that struck Turkey and Greece has reached 27 - including two children.
Greece's Prime Minister Kyriakos Mitsotakis tweeted today to announce the deaths of the two children following the disaster. Turkey has reported that at least 804 people were injured on top of the 25 fatalities there.
Here is an eyewitness account of the aftermath of the earthquake in Izmir, Turkey, from Sky's Moscow correspondent Diana Magnay.
Dust wafts over the rubble. Every now and then rescue teams spray water on what's left of this crumpled apartment block so their colleagues can see what they're doing.
Bulldozers tear away at the sides, dumping debris into huge pick up trucks. Draped strangely across the twisted wire and concrete are blankets and curtains, sheets and towels - the fabric of people's private lives strewn across the sorry remains of their homes.
Someone yells a command. "Quiet!" Everything stops.
Rescue workers are listening for signs of life. The crowd waits too. Only the sound of mobile phones cuts through. Then everything starts again. And still the anxious relatives don't know what - if anything - the rescue teams heard.
63-year-old Ragip Öztürk was one of the first to be rescued, twenty minutes after the quake hit. He hid beside his fridge, which he thinks protected him when the ceiling caved in.
He tapped against metal with a pen and shouted to get attention. He was found.
His wife though is still somewhere underneath that monstrous pile of rubble. He thinks she was in the lift, heading out for a walk to the park with their niece and nephew.
They've been married for 40 years. "Love your spouse, enjoy life", he says, choking on the words. "And in an earthquake, don't panic".
We're told there are still 40 people trapped inside this one building. Among them are Koray Demirhan's four nieces.
They're only little, aged between two and eleven. His sister, their mother, weeps nearby.
Other relatives with tear-streaked faces sit wrapped in blankets in a neighbouring cafe which is handing out food and drinks for free. Aid workers bring round soup, water, coffee and pastries.
Izmir's mayor says 20,000 of the local boyoz speciality were baked overnight for the relief efforts. They're even offered to journalists and they're delicious. The community is in this together, everyone mingling, watching, helping and hoping.
Turkey has long experience of earthquakes. Esref Bati has lived through a few but he says this one was the biggest he remembers.
He is in a wheelchair and only has one leg. It must be scary to be that immobile during an earthquake. He was in hospital having dialysis at the time and screamed to be taken out.
The nurses hoisted him out of bed and to the street. "There's no way it was just a 6 magnitude quake", he says. "It was far bigger".
His generation remember well the earthquake in 1999 in Izmit which killed at least 17,000 people. Turkey lies on major fault lines and geologists warn that a major quake in Istanbul is only a matter of time.
But the Turks must live with it, hoping that the walls around them are earthquake-proof. The rubble I'm looking at suggests that plenty are not.
Rescue teams in the Turkish port city of Izmir are hunting through the rubble of collapsed buildings for survivors of Friday's powerful earthquake.
The death toll from the quake, which also struck the Greek island of Samos, has risen to 27, with over 800 injured.
Delicate operations to pull people from the rubble in Izmir are taking place as hundreds of aftershocks hit the area.
The US Geological Survey (USGS) said the earthquake was 7.0 magnitude, but Turkey put it lower at 6.6.
The shallow tremor triggered tidal waves that hit coastal areas and islands in both Turkey and Greece.
Twenty-five people were killed in Izmir, in the west of Turkey, officials said. A girl and a boy died in Samos when a wall collapsed on them.
Work continued through the night to search for survivors in 20 buildings that were destroyed as a result of the earthquake.
Officials said search and rescue operations had been completed in eight buildings, while operations continued in nine other locations.
Some 100 survivors have been pulled out alive from the rubble so far, Turkey's Environment and Urbanisation Minister Murat Kurum told reporters.
A 16-year-old girl and her dog were pulled alive from the concrete in the early hours of Saturday morning, according to Turkish newspaper Sozcu.
Authorities in central Izmir have set up a tent area to house about 2,000 people overnight, amid fears that more buildings could collapse.
Nearly 4,000 rescue workers, 475 vehicles and 20 sniffer dogs have been deployed, Turkey's state-run Anadolu news agency reports.
But their work has been hampered by nearly 400 aftershocks, according to Turkey's national disaster agency Afad, with 33 of these more powerful than 4.0 magnitude.
Rescuers are working hour after hour searching for life under mounds of crushed concrete.
In the past few hours, they have freed a mother and three of her children who had been buried alive for almost 18 hours. Now teams are trying to reach the fourth child.
There are clusters of distraught relatives outside a flattened apartment block, which was eight stories high. As many as 40 residents are still unaccounted for - among them 15-year-old twins.
Field kitchens and tents have been set up for those who are homeless and traumatised.
Turkey is now suffering from collective aftershock - as local TV channels provide continuous coverage of the rescue efforts. This was the second powerful earthquake this year. There are renewed fears about the active fault lines beneath the country. Many worry when the next deadly quake may come.
The earthquake struck 14km (nine miles) off the Greek town of Karlovasi on Samos island at 13:51 local time (11:51 GMT), according to the USGS.
It said the quake - which was felt as far away as Athens and Istanbul - struck at a depth of 21km (13 miles), although Turkish officials said it was 16km below ground.
Most of the damage occurred in Izmir, off Turkey's Aegean coast - where the tremor sent many people running out into the streets in fear and panic.
"It was a really strong shaker almost enough to knock you off your feet. Running out of the house with my children was like a drunken wobble," Chris Bedford, a retired British teacher who lives in Urla, west of Izmir, told the BBC.
There were reports of flooding in Izmir after the sea level rose, with one person killed after their wheelchair was hit and overturned by rising water.
Izmir is Turkey's third largest city with a population of nearly three million.
Turkey and Greece both sit on fault lines and earthquakes are common.
Two teenagers were killed when a wall collapsed on Samos. Eight people were injured across the island, where about 45,000 people reside.
A mini-tsunami flooded the port of Samos and a number of buildings were damaged. Greek officials put the magnitude of the tremor at 6.7.
"We felt it very strongly," local journalist Manos Stefanakis told the BBC, adding that smaller aftershocks were continuing.
He said it was the biggest tremor to have hit the island since 1904.
Fareid Atta, another Samos-based journalist, told the BBC that the damage was "quite extensive along the seafront" of the island's main town.
"Many businesses will be going under after this," he said.
Residents were urged to stay outdoors and keep away from coastal areas.
Greek Prime Minister Kyriakos Mitsotakis said he had offered his condolences to Turkish President Recep Tayyip Erdogan.
"Whatever our differences, these are times when our people need to stand together," Mr Mitsotakis wrote in a tweet.
Mr Erdogan later responded in a tweet: "Turkey, too, is always ready to help Greece heal its wounds. That two neighbours show solidarity in difficult times is more valuable than many things in life."
Relations between Greece and Turkey have been particularly strained in recent months by a dispute relating to control of territorial waters in the Mediterranean and the resources beneath them.
In January more than 30 people were killed and more than 1,600 injured when an earthquake struck Sivrice in Turkey's eastern Elazig province.
In July 2019, the Greek capital Athens was hit by a tremor that knocked out power to large parts of the city.
A powerful quake that struck the Turkish city of Izmit, near Istanbul, in 1999 killed about 17,000 people.
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The third victim of the Nice church attack has been named as Nadine Devillers, 60.
Mayor of Nice Christian Estrosi made the announcement on social media on Saturday morning.
The other two victims of the attack were mother-of-three Simone Barreto-Silva, 44, and church worker Vincent Loques, 55.
It came as Reuters reported a third person has been arrested in connection with the killings at the Notre Dame church.
The person being held is said to be a 35-year-old Nice resident suspected of meeting with the presumed attacker the day before the atrocity.
A police source told Reuters that the latest arrest took place on Friday.
The two previously arrested were 21-year-old suspect Brahim Aouissaoui, and a 47-year-old man who was detained on suspicion of having been in contact with Aouissaoui.
France's president Emmanuel Macron deployed thousands of soldiers to protect sites including places of worship and schools following the attack.
Aouissaoui was reportedly unknown to security services, having arrived in Europe by boat last month.
Tensions have been rising in France around cartoons of the Prophet Muhammad which Muslims say are offensive.
The attack in Nice occurred almost two weeks after Samuel Paty - a teacher in Paris - was decapitated by an 18-year-old Chechen after showing pupils a cartoon in a lesson on freedom of expression.
The row over depictions of the Prophet Muhammed has led to protests around the world in countries like Lebanon, Pakistan, Bangladesh and Somalia, with calls to boycott French products.
Following the attack, President Macron said the country had been targeted "over our values, for our taste for freedom, for the ability on our soil to have freedom of belief".
The 60-year-old woman who was beheaded in the Nice terror attack was a kind-hearted devout catholic, it has emerged.
Married Nadine Devillers was a regular parishioner at the Notre-Dame-de-l'Assomption church.
Her husband broke down in tears when he confirmed that she had died in such terrible circumstance in a desperate phone call from her friend of 30 years.
Her childhood friend Joelle Guichard told Var Matin newspaper: ‘She was kindness with a capital K.
Nice terror attack victim Nadine Devillers, 60, is pictured in a photograph before the horrific incident on Thursday. Nadine's husband broke down in tears when he confirmed his wife had died in such terrible circumstances
‘We have been friends for 30 years. I heard about the horror in Nice. I immediately thought of Nadine.
‘She lives not far from the cathedral and she is a devout catholic. I took my phone to call her. I saw I had a missed call, it was Nadine’s husband.
‘As soon as he picked up the phone, when I heard his sobs, I understood.
‘Is it her?, I asked. ‘”Yes,” he replied. “It is her”.
‘”It’s an absolute nightmare”, he added.’
The two women had grown up in Draguignan, a town in the Var region, west of Nice.
Joelle, added: ‘Nadine left for Nice aged 18. She had a strong and pure heart.’
Ms Guichard moved to Quebec, Canada, but they stayed in touch with regular phone calls.
Security forces guard the area after a reported knife attack at Notre Dame church in Nice, France yesterday
The vicious knife attack at Nice’s Notre Dame cathedral that left three dead was planned and organised from abroad, French investigators believe.
The profile of the attacker, the identity of his contacts and the speed of the attack suggest the atrocity had been planned in advance by committed jihadists, Le Parisien newspaper reported this morning.
It said: ‘After the killings on Thursday at Notre-Dame de l’Assomption Basillica, the provenance, profile, contacts and rapid act of the alleged assailant are questioning investigators.’
Meanwhile anti-terrorist police arrested a third man in connection with the atrocity.
The suspect, a 35-year-old from a run-down part of Nice, is alleged to have ‘rubbed shoulders with the perpetrator the day before the attack’, according to judicial sources.
The man was arrested at home in Nice North after 10pm last night.
He is believed to have close links to the 47-year-old who was arrested on Thursday night nearby.
Yesterday, the Tunisian terrorist's family revealed the knife attacker had turned to a hermit-like life of prayer following a lifestyle of drink and drugs before the atrocity.
Brahim al-Aouissaoui, 21, beheaded a 60-year-old woman, slit the throat of sexton Vincent Loques, 55, and stabbed mother-of-three Simone Barreto Silva, 44, to death at Nice Notre-Dame Basilica on Thursday morning.
In a little over six weeks, Aoussaoui travelled from Tunisia, into Italy via Lampedusa, was taken to the mainland, and released by Italian authorities under deportation order. From there, it is thought he caught a train to Paris, where he stayed for a little over two weeks, before going to Nice and launching his attack
Nice terrorist Brahim Aoussaoui is seen in a photograph taken at the Italian port city of Bari, where he disembarked from a coronavirus quarantine ship on October 8 - marking his arrival in mainland Europe
Another image of Aouissaoui is held by his mother in the Tunisian province of Sfax, where she revealed that she had begged her son not to travel to France
He was shot 14 times, tasered, and remains in hospital in critical condition.
Speaking from Sfax, Tunisia, his mother said Aoussaoui had left school and worked as a motorcycle mechanic, at first spending his wages on alcohol and drugs.
She told the Telegraph: 'I used to tell him, ''we are poor and you're wasting money?'' He would reply ''if God wills it, he will guide me to the right path, it's my business''.'
But over the last two and a half years he became increasingly religious and isolated.
'He prayed [and] went from home to work and back, not mixing with others or leaving the house,' his mother said.
His brother Yassine said that Aoussaoui worked harvesting olives in Italy after leaving Tunisia, then went on to France.
On the day before the attack, October 28, he called the family to say he had just arrived in the country and would be sleeping in front of the church - sending a photograph of himself at the cathedral that would be the location of the attack.
'He didn't tell me anything,' said Yassine. He added that he did not understand how he could carry out the Nice attack so soon after arriving in France.
The country's Interior Minister Gerald Darmanin said that the attacker 'wasn't on any of our security watchlists, either French or European,' and added that France was 'at war with Islamist extremism... an enemy that is both internal and external'.
Brahim Aoussaoui, a 21-year-old Tunisian migrant, receives medical treatment after killing three worshippers
He told RTL radio: 'We need to understand that there have been and there will be other events such as these terrible attacks.'
Mr Darmanin said after a top-level security meeting that 3,500 reserves in France's gendarme force would be called up to give local authorities a total of 7,000 members of the security forces at their disposal to ensure security.
Some 4,000 additional French troops will also be mobilised from next week to raise the numbers taking part in the ongoing Sentinelle security operation to 7,000, the army confirmed.
Aoussaoui left his family's impoverished village of Bou Hajla in Tunisia on or around September 15, according to the country's judiciary spokesman, having paid smugglers to take him to Europe.
Five days later he landed with 28 other migrants on the Mediterranean island of Lampedusa, where records show he was placed into a coronavirus quarantine centre.
On September 25, he was transferred from the centre to a quarantine ship, the Rhapsody, which set sail for the port city of Bari, on Italy's eastern coast.
The ship moored offshore while the migrants waited out the quarantine, with disembarkation beginning on October 8. Aoussaoui was among those disembarked, with his fingerprints, name, and date of birth noted.
Border officials also took his photograph - which shows him smiling while holding up a card with the number '104' printed on it. It captures the moment Aoussaoui entered mainland Europe.
Officials also carried out background checks, which Italian newspaper Corriere della Serra reports came back clean. They found Aoussaoui had no criminal background, had not tried to enter the country before, and was not on any international watch-list.
Nevertheless, Aoussaoui was deemed to have no legal right to enter Europe, and was served with a deportation order which gave him seven days to leave Italy.
What happened next is now the subject of an investigation. Despite being under deportation order, it seems Aoussaoui was freed by Italian immigration officials. He did not head back to Tunisia, but instead went to France.
Corriere reports that border officials had split the migrants into three groups - the first was 104 adults who had criminal backgrounds or other reasons for suspicion, who were taken to a detention centre.
The second, a group of 177, almost half of whom were children, who were placed in shelters. A third group of 104 individuals, of which Aoussaoui was a part, were not sent to a detention centre or shelter - leaving them free to go.
French security sources have also suggested that Aoussaoui was due to be deported, but Tunisia wouldn't recognise him as a citizen. Amid the confusion, he simply walked out of detention.
Investigations are now underway in France, Italy and Tunisia to establish the exact chain of events.
From here, Aoussaoui's movements become less clear. Some time between October 9 and 10, it appears he departed Bari for Paris on a train, allowing him to skirt French border checks.
After arriving in Paris, his movements and contacts are a mystery. But it is thought he stayed in and around the city until October 29, the day of the Nice attack.
That morning, took an early train to Nice, arriving in the city at 6.30am, according to French investigators.
He is known to have taken a photo of the Notre Dame basilica - the same church he would later attack - using a phone to send it to his brother back in Tunisia, saying he wanted to spend the night there.
As the church opened at 8.30am he made his way inside before pulling out a 12-inch blade and launching his attack, killing three people in 'horrific' fashion.
The first to die was an as-yet unidentified parishioner in her sixties, a regular at the church who had come to pray first thing in the morning, and who had her throat slit near the church's font in an attempted beheading.
The next to die was the church's 54-year-old sacristan Vincent Loques, who had opened the doors to Aoussaoui and was busy preparing for Mass. He was due to celebrate his birthday on Friday.
Brazilian-born Simone Barreto Silva, 44, another parishioner, was then stabbed multiple times but managed to escape the church around 8.54am, running to a nearby burger bar where she bled to death.
The mother-of-three's last words to paramedics were: 'Tell my children that I love them'.
Friends in Brazil said that Silva had been in France for 30 years. Brahim Jelloule, the owner of the restaurant that she staggered to before dying, revealed that his brother first saw Silva covered in blood in the street.
Jelloule, who is a Muslim, said his brother and a staff member dragged Silva inside before going into the church and confronting Aoussaoui, who was still inside an armed with a knife.
The pair fled and called police, who arrived around 9.10am and shot Aoussaoui 14 times as he screamed 'Allahu Akbar' - God is greatest in Arabic - a phrase he kept shouting even after being sedated.
Investigators found two unused knives, a Koran and two mobile phones, in addition to a bag with some personal effects. He was unknown to French security services, Mr Ricard told a press conference.
A picture showing Aoussaoui bleeding on the floor and being treated by paramedics after he was shot by police was tweeted by the head of the respected SITE organisation.
Last night, police arrested a 47-year-old man in Nice who is thought to have had contact with Aoussaoui the day before the attack and may have provided him with a telephone.
Investigators are looking into Aoussaoui's contacts - trying to determine whether he was self-radicalised, or was directed to carry out his attack by a terror group.
The attack came just days after Thabat, an al-Qaeda-linked press agency, published a call for Muslims to wage 'jihad' (holy war) in France over newspaper Charlie Hebdo's caricatures of the Prophet.
Prosecutors in Tunisia have also opened an investigation into Aoussaoui's contacts and life before he left the country, including whether he had links to terror groups.
The country's top prosecutor has said the 21-year-old was not being monitored by anti-terror forces, but will probe further.
Aoussaoui's family, speaking from the impoverished Tunisian town of Bouhajla where he lived before going to Europe, said he had been in contact with them since arriving in France.
From the Tunisian province of Sfax, mother Kmar, her eyes wet with tears, said she was surprised to hear her son was in France when he called upon his arrival and had no idea what he was planning.
'You don't know the French language, you don't know anyone there, you're going to live alone there, why, why did you go there?' she said she told him over the phone at the time.
She said that Aoussaoui had turned to religion and isolated himself in the past two years.
'He prayed... (and) went from home to work and back, not mixing with others or leaving the house,' she said.
But before that 'he drank alcohol and used drugs. I used to tell him: 'We are poor and you're wasting money?' He would reply: 'If God wills it, he will guide me to the right path, it's my business'.'
His brother told the Al Arabiya TV network: 'He told me he wanted to spend the night in front of the cathedral. He also sent me a photo of the building. He phoned me when he arrived in France.'
He then told of the family's shock that Brahim Aoussaoui was responsible for the terrorist attack.
'What we saw in the images is him, our son,' they said.
Brahim had struggled to find regular work before leaving the country and did 'various jobs', a neighbour said.
Meanwhile the Tunisian judicial spokesman said Brahim had not been classified as a hardliner before leaving the country, and was not known to security forces. He said Brahim had left the country on or around September 14.
The killings, which occurred ahead of the Catholic holy day of All Saints Day on Sunday - and on the day that Sunni Muslims mark the Prophet Mohammed's birthday - prompted the French government to raise the terror alert level to the maximum 'emergency' level nationwide.
VICTIM: Brazilian-born Simone Barreto Silva, 44, also succumbed to her injuries after seeking refuge in a nearby burger bar. Her last words were to paramedics, who she told: 'Tell my children that I love them'
VICTIM: Vincent Loques, 54, a sacristan of the Notre Dame basilica in the city of Nice, was brutally killed as he prepared for the first Mass of the day after 21-year-old Tunisian migrant Brahim Aoussaoui attacked the church
KILLER'S MOTHER: Kmar (right), the mother of Nice attacker Brahim Aouissaoui who killed three people in Thursday's terror attack, cries at her home in Tunisia last night after being questioned by counter-terrorism police
Counter-terrorism police last night arrested a 47-year-old man in Nice on suspicion of being an accomplice to the knifeman and providing him with one of two mobile phones that the attacker was found with.
The man is believed to have been in close contact with the 21-year-old jihadist on Wednesday, the day before the attack, police sources told French media.
President Emmanuel Macron, who quickly travelled to Nice, announced surveillance of churches by France's Sentinelle military patrols would be bolstered to 7,000 troops from 3,000.
Security at schools would also be boosted, he said. 'Quite clearly, it is France that is being attacked,' Mr Macron said, and vowed the country 'will not give up on our values'.
He threw his weight behind the Catholic church, saying: 'The entire nation will stand so that religion can continue to be exercised freely in our country.' He also called for 'unity' urging people 'not to give in to the spirit of division'.
Interior Minister Gerald Darmanin, speaking on French radio on Friday, added that France is 'at war... against an ideology, the Islamist ideology, which wants to impose its cultural codes, its way of living... through terror.'
He said France was a 'big target' for terrorists because it symbolises freedom, secular society, and the rule of law - pointing to the ongoing trial of 14 people charged over the 2015 attack on Charlie Hebdo magazine.
'Islamism is a form of fascism in the 21st century,' he added, 'an extremism that we must fight.'
Meanwhile Eric Ciotti, deputy of the Alpes-Maritime region where Nice is located, said France has now 'become the preferred target of terrorists' and the Nice in particular has become a 'martyr city'.
Nuns put flowers in tribute to the victims of a deadly knife attack at the Notre Dame church in Nice
A woman puts a candle near a picture of Vincent Loques, sexton of Notre Dame church, one of the victims of a terror attack
Flowers, messages and candles lie in front of the Notre Dame church, in Nice, France
Flowers, messages and candles lie in front of the Notre Dame church, in Nice
A nun lays flowers outside the Notre-Dame de l'Assomption Basilica in Nice
A man prays next candles and flowers left in memory of the victims of a knife attack in front of the Notre Dame church in Nice
Eric Ciotti, President of the Departmental Council of the Alpes-Maritimes and member of Parilament, pays tribute to the victims of a deadly knife attack at the Notre Dame church
Notre-Dame de l'Assomption Basilica's Priest Franklin Parmentier (third left) and right-wing party Les Republicains MP Eric Ciotti (third right) pay homage at the church
A woman cries as she speaks to reporters in front of the Notre Dame church in Nice
French soldiers patrol near the Notre Dame church the day after a deadly knife attack in Nice
Having spoken to Macron since the attack, Ciotti said he has 'noted a change in tone from the President.'
'He was very wrong in giving the impression of flattering the different communities,' said Eric Ciotti. 'I expect a profound, radical change in policy.'
Ciotti said he has called on Macron 'to stop all forms of immigration' and has received assurances that a 'moratorium on bogus asylum seekers' will follow shortly.
As part of the 'change of tone', Darmanin confirmed that 18 suspected Islamists will be expelled from France in the coming days, in addition to 14 that were expelled after teacher Samuel Paty was beheaded.
Mourners attended vigils to pay tribute to the victims of the triple killing last night. They lit candles outside the Notre-Dame de l'Assomption Basilica in Nice and in front of the French Embassy in Berlin.
There were also tears in Tunisia where the attacker's mother, Kmar, wept after being questioned by police at her home in Sfax.
The attack comes amid fury across the Islamic world at President Macron for defending satirical cartoons of the Prophet Mohammed, and on the day that Sunni Muslims mark the Prophet's birthday.
Several Muslim-majority countries launched campaigns to boycott French products, while protesters burnt the tricolor and posters of Macron at demonstrations in Syria, Libya, Bangladesh, Afghanistan, Pakistan and Palestine.
Also on a day of terror for France:
Elsewhere on Thursday a man was arrested around 1pm in Sartrouville, north of Paris, after his father called police and said his son had left home and planned 'to do as in Nice.'
Police stopped the man in his car near a local church, and Le Parisien reports that he was in possession of a knife. The car was searched, but nothing else was found.
Meanwhile in Lyon, an Afghan man in his 20s was arrested while trying to board a tram carrying a long knife. The man was known to French intelligence services.
In Avignon, a man armed with a handgun began threatening people in the Montfavet around 11.15am.
Police rushed to the scene and confronted the man, who refused to drop his weapon. Police then shot the man with a Taser, which failed to stop him, so they opened fire with live ammunition, killing him.
It was initially thought that the man was an Islamist, and French media reported that he had been shouting 'Allahu Akbar'.
But it was later revealed that he was a far-Right extremist who belonged to the anti-Islam Identitarian Movement, and had been giving Nazi salutes.
Meanwhile in Saudi Arabia, a man was arrested after stabbing a guard at the French consulate with 'a sharp tool'. The attacker was arrested while the guard was taken to hospital with non-life threatening injuries.
France's embassy in Riyadh condemned the 'attack on diplomatic premises which can never be justified'.
French diplomats also called on Saudi authorities to 'shed light on this attack' and ensure the safety of French people in the kingdom.
'We call on our colleagues in Saudi Arabia to show maximum vigilance,' the embassy said after Saudi security forces apprehended the suspect, who is said to be a Saudi national in his 40s.
The Nice attack happened less than half a mile from where another attacker plowed a truck into a Bastille Day crowd in 2016, killing dozens.
Despite the attack, protests against France and Macron specifically continued on Friday - with thousands of Muslim worshippers leaving Friday prayers in Pakistan and taking to the streets, chanting anti-French slogans and calling for a boycott of French products.
An estimated 2,000 worshippers celebrating the Mawlid, the birthday of the Prophet Muhammad, took to the streets in the eastern city of Lahore.
Dozens of people furiously stomped on French flags and cried for the boycott of French products. In Multan, a city in Pakistan's eastern Punjab province, thousands burned an effigy of French President Emmanuel Macron and demanded that Pakistan sever ties with France.
More gatherings were planned for later Friday in Pakistan, including the capital, Islamabad, where police were out in force to prevent possible demonstrations outside the French Embassy. The atmosphere was tense as police positioned shipping containers to block the roads.
Other protests, largely organized by Islamists, are expected across the region, including in Lebanon and the Gaza Strip.
In Afghanistan, members of the Islamist party Hezb-i-Islami set the French flag ablaze. Its leader, Gulbuddin Hekmatyar, warned Macron that if he doesn't 'control the situation, we are going to a third world war and Europe will be responsible.'
Forensic officers work at night in front of Notre Dame Basilica in Nice after a terror attack on a Catholic church
Forensic officers work at night in a coffee shop near Notre Dame Basilica in Nice following an Islamist terror attack
People light candles outside the Notre-Dame de l'Assomption Basilica in Nice following an Islamist terror attack
Tribute to the victims of the attack on the Notre-Dame basilica in Nice, with mourners holding the tricolor flag by the church
People mourn as they attend a commemoration for the victims killed during an in a church attack in Nice
Muslim faithfuls pray at the Notre-Dame de la Garde basilica in Marseille, south-eastern France
French police officers secure the street near the entrance of the Notre Dame Basilica church in Nice
Archbishop of Paris Michel Aupetit, French Prime Minister Jean Castex and President of Bishops' Conference of France Eric de Moulins-Beaufort talk to the press after their meeting at the Matignon Hotel in Paris
People mourn as they attend a commemoration for the victims killed during a church attack in Nice
People light candles outside the Notre-Dame de l'Assomption Basilica in Nice in a vigil to remember the victims
A woman places a candle at a makeshift memorial for the victims of the Nice attack, in front of the French embassy in Berlin
Over the past week, protests and calls to boycott French products have spread rapidly from Bangladesh to Pakistan to Kuwait. Social media has been pulsing with anti-France hashtags.
Muslim leaders, Turkish President Recep Tayyip Erdogan in particular, have loudly criticized France for what they see as the government's provocative and anti-Muslim stance.
French politicians were taking part in a debate on the country's new coronavirus restrictions when news of the attack reached them.
They observed a minute of silence before the debate broke up so an emergency security meeting could be held.
After the meeting, Prime Minister Jean Castex moved the threat level from 'risk of attack' to the 'emergency level', meaning threats are imminent.
Images on French media showed the neighborhood locked down and surrounded by police and emergency vehicles. Sounds of explosions could be heard as sappers exploded suspicious objects.
The Catholic Church issued a statement, condemning the 'unspeakable act' and saying that 'Christians must not become a symbol to be cut down.'
Catholic bishops in France called for all church bells to ring at 3pm in solidarity with the victims, before adding: 'It is urgent that this gangrene be stopped as it is urgent that we find the indispensable fraternity which will hold us all upright in the face of these threats'
Pope Francis was among those leading an outpouring of sympathy, saying: 'I pray for the victims, for their families and for the beloved French people, so that they can react to evil with good.'
Former French Presidents Nicolas Sarkozy and Francois Hollande also issued statements, the former condemning an 'act of barbarism' and calling on people to oppose 'the enemies of democracy; while the latter vowed that 'democracy is our weapon... in the face of Islamist terrorism'.
Tunisia strongly condemned a deadly 'terrorist' attack at the church in Nice and said it launched an investigation after reports the assailant was Tunisian.
'Tunisia strongly condemns the terrorist incident in Nice and expresses its solidarity with the government and people of France,' said a statement from the foreign ministry.
The North African state stressed its 'rejection of all forms of terrorism and extremism,' and warned against 'ideological and political exploitation of religions,' according to the statement.
The assailant, who was shot by police and arrested, is reportedly a Tunisian migrant who recently arrived in France via Lampedusa, Italy, according to sources close to the case.
Condemnation came from US President Donald Trump, UN chief Antonio Guterres, as well as European, Arab and Israeli leaders.
'Our hearts are with the people of France. America stands with our oldest Ally in this fight,' Trump tweeted. 'These Radical Islamic terrorist attacks must stop immediately. No country, France or otherwise can long put up with it!'
Democratic White House candidate Joe Biden vowed to crack down on 'extremist violence' if elected.
'Jill and I are keeping the French people in our prayers following the horrific terror attack in Nice - which targeted innocents in a house of worship,' he said on Twitter.
'A Biden-Harris administration will work with our allies and partners to prevent extremist violence in all forms.'
Russian President Vladimir Putin has extended his condolences to French President Emmanuel Macron and families of the victims of the attack in Nice.
In a telegram quoted by the Kremlin, Putin called the attack 'a cynical and a cruel crime inside a church' and said that 'the notions of human morals are absolutely alien to terrorists.'
Saudi Arabia 'strongly condemned' deadly stabbings Thursday in the French city of Nice, which authorities are investigating as the latest terrorist attack in France.
A knife-wielding man killed three people at a church in Nice on Thursday, slitting the throat of at least one of them, in an attack that triggered global shock.
'We strongly condemn and denounce the terrorist attack that occurred... in Nice, France, which resulted in the death and injury of a number of people,' the Saudi foreign ministry said on Twitter.
'We reiterate the kingdom's categorical rejection of such extremist acts that are inconsistent with all religions, human beliefs and common sense, and we affirm the importance of rejecting practices that generate hatred, violence and extremism.'
The French Council of Muslim Worship also issued a statement strongly condemning the attack.
'As a sign of mourning and solidarity with the victims and their relatives, I call on the Muslims of France to cancel all the festivities of the Mawlid feast,' which takes place on October 28 and 29.
The attack is just the latest to strike France, after history teacher Samuel Paty was beheaded in another attack north of Paris.
Paty was stabbed by an 18-year-old Chechen after he showed the cartoons to his students during a lesson on free speech.
A woman, believed to be the wife of the church warden (wearing the beige jumper) is seen at the scene of the attack in Nice
A woman, believed to be a close friend of one of the victims, weeps in front of the basilica after three people were killed
President Emmanuel Macron visits the scene of a reported knife attack at Notre Dame church in Nice
Three people have died after a knifeman attacked the Notre Dame basilica in Nice, before he was shot by police
French coroners carry out the body of one of the three people killed at the Notre-Dame de l'Assomption Basilica in Nice
Police swarmed the area around 9am, running into the church before the attacker was shot and arrested. Mayor Christian Estrosi said the attacker kept shouting Allahu Akbar even after being medicated
French politicians were taking part in a coronavirus lockdown debate when the news reached them - and held a minute of silence in the chamber (pictured)
General view of the Black Carpet to pay tribute to victims of the attack in Nice at the Cannes Festival
Players and referees at the OGC Nice v Hapoel Be'er Sheva game in Allianz Riviera, Nice, line up before the match in a minute silence to commemorate the victims of the Nice killings
Parents of pupils at the school had led a campaign against him, before the attack took place. Seven have been arrested.
Just a few weeks earlier, an 18-year-old Pakistani stabbed a wounded two people outside the old offices of satirical magazine Charlie Hebdo.
The man has admitted to police that he was targeting the magazine for publishing cartoons of the Prophet Mohammed.
British Prime Minister Boris Johnson also spoke out to condemn the attack, tweeting: 'I am appalled to hear the news from Nice this morning of a barbaric attack at the Notre-Dame Basilica.
'Our thoughts are with the victims and their families, and the UK stands steadfastly with France against terror and intolerance.'
German Chancellor Angela Merkel expressed 'solidarity' with France, saying she is 'deeply moved by the cruel murders in a church in Nice.'
'I condemn the odious and brutal attack that has just taken place in Nice and I am with France with all my heart,' European Commission president Ursula von der Leyen tweeted.
'We will remain united and determined in the face of barbarity and fanaticism.'
Italian Prime Minister Giuseppe Conte condemned a 'cowardly attack' and said: 'Our convictions are stronger than fanaticism, hatred and terror. We embrace the families of the victims and our French brothers. We are united!'
Spanish counterpart Pedro Sanchez added: 'We continue to defend freedom, our democratic values, peace and the security of our citizens.'
A harder tone came from Hungary, where populist Prime Minister Viktor Orban wrote that the attack showed clearly 'that our culture, our way of life and our European values are in the cross hairs of extremist terrorism.
'We are ready to join forces in order to protect traditional European values and the traditional European way of life,' Orban added.
Austrian Chancellor Sebastian Kurz, who previously governed with far-right ministers, called the murders in Nice 'a despicable Islamist terror attack.
'France has our full solidarity. We will defend our values and European 'way of life' with all our might against Islamists and political Islam,' Kurz said.
It also comes amid mass protests in many Islamic countries against Emmanuel Macron, after the French President spoke up in defence of the cartoons.
Tweeting in Arabic, he wrote: 'Nothing makes us hold back, ever. We respect all differences in the spirit of peace. We never accept hate speech and defend rational debate.
'We will always stand by human dignity and universal values.'
His remarks have prompted demonstrations in Gaza, Turkey, Pakistan and Bangladesh, and boycotts of French products in Jordan, Kuwait, Qatar and Palestinian territories.
Turkish President Recep Tayyip Erdogan has led outrage at Macron, suggesting that he is mentally ill and needs to have his health evaluated.
On Thursday, Ankara said strongly condemned Thursday's 'savage' knife attack in southern France that left three people dead, offering its 'solidarity', despite a running diplomatic spat with Paris.
'We strongly condemn the attack committed today inside the Notre-Dame church in Nice,' a foreign ministry statement said, while offering condolences to the victims' relatives.
Pakistanis take part in a rally for the Mawlid al-Nabi holiday that celebrates the birthday of Islam's Prophet
Pakistanis take part in a rally for the Mawlid al-Nabi holiday that celebrates the birthday of Islam's Prophet
Muslim demonstrators shout slogans as they tear a poster of French President Emmanuel Macron during a protest calling for the boycott of French products in Hyderabad, India
Muslims take part in a protest after Friday prayer, calling for the boycott of French products in Dhaka, Bangladesh
Muslims shout slogans against French President Emmanuel Macron during a protest in Hyderabad, India
Egypt's foreign ministry said it 'stands as a government and people with... France in combatting this hateful incident'. Qatar voiced strong condemnation and reiterated its rejection of violence and terrorism, especially against places of worship and regardless of the motives
The foreign ministry also expressed condolences to the victim's families.
Lebanese prime minister designate Saad Hariri voiced his 'strongest condemnation and disapproval of the heinous criminal attack,' and urged Muslims 'to reject this criminal act that has nothing to do with Islam or the Prophet'.
The Islamic world's anger at France deepened on Wednesday as Turkey condemned a Charlie Hebdo cartoon showing its president Recep Tayyip Erdogan lifting a woman's burka to look at her naked backside.
Erdogan called the cartoonists 'scoundrels' and accused the West of wanting to 'relaunch the Crusades' by attacking Islam after the image appeared on the front of this week's magazine.
'I don't need to say anything to those scoundrels who insult my beloved prophet on such a scale,' Erdogan said, calling it a 'disgusting attack'.
Erdogan's spokesman on Thursday deflected blame over the attack in France, saying 'we categorically deny any effort to associate us with any kind of violence.'
'We will continue to confront any politician who insults our religion and values. We feel we owe no apology to anyone for expressing our strong opposition to racism and xenophobia,' he said.
'Our President has always called for cooperation against terrorism and extremism. We renew that call while we reject the damaging rhetoric and actions against our religion and culture regardless of its ideological source.'
Showing Erdogan in a T-shirt and underpants, the caricature has Erdogan saying 'Ooh, the Prophet' as he looks at the woman's backside, and comes with the caption: 'Erdogan - in private he's very funny'.
A Charlie Hebdo cartoon showing the naked Prophet's backside was the image which French school teacher Paty showed to his class in the lesson which led to his murder and beheading earlier this month.
President Macron has staunchly defended free expression and the right to mock religion in the wake of the terror attack, but has become a target of anger in the Islamic world.
Turkey has vowed to take 'legal, diplomatic actions' in response to the cartoon while Pakistan's PM Imran Khan called for an end to 'attacks on Islam', saying the West should be willing to treat blasphemy in the same way as Holocaust denial.
Meanwhile Iran's president Hassan Rouhani also took aim at France by warning that insulting the Prophet would encourage 'violence and bloodshed'.
Muslims chant slogans after Friday prayer as they take part in a protest calling for the boycott of French products in Dhaka
An effigy depicting the French president Emmanuel Macron is seen as Muslims chant slogans denouncing him during a protest in Dhaka, Bangladesh
Muslims burn an effigy depicting French President Emmanuel Macron as they take part in a protest calling for the boycott of French products in Bangladesh
Muslims hold an effigy depicting French president Emmanuel Macron after Friday prayer in Dhaka, Bangladesh
Muslims hold pictures of the French president Emmanuel Macron after Friday prayer in Dhaka, Bangladesh
