Florida Governor Ron DeSantis has said people "have a right to know" how a 12-storey building collapsed in the US city of Miami, as the search for survivors continues.
The number of people listed as missing remains at 159, officials say, with four people known to have died.
At least 102 people have now been accounted for, but it is uncertain how many were inside when it came down.
Questions are now growing about what caused the building to collapse.
Speaking on Friday, Governor DeSantis said the focus remained on finding survivors.
But he called for a "timely" explanation for what happened, adding they needed to know "if this is a bigger issue, or something unique to the building".
Champlain Towers South was completed in 1981. When it collapsed it was going through a recertification process for 40-year-old buildings, in line with city safety regulations.
What's the latest with the search?
Miami-Dade County Mayor Daniella Levine Cava said at a press conference on Friday night she was hopeful they would find survivors overnight.
"We have hope because that's what our search and rescue team tells us, that they have hope," she told reporters.
Rescuers are working in rotation with a limited number allowed on site at any one time to prevent any further collapse, she said.
Teams from Mexico and Israel have also reportedly arrived to help with the search.
As night fell on Friday, the fire rescue service warned people nearby to stay indoors due to the "smoky conditions".
If you live near the area of the #SurfsideBuildingCollapse, you may be experiencing smoky conditions, which can affect those with respiratory conditions. Please stay indoors, keep your windows and doors closed, and run your a/c by recirculating the air inside your home. pic.twitter.com/SOGVdfcefK
— Miami-Dade Fire Rescue (@MiamiDadeFire) June 26, 2021
President Joe Biden has approved an emergency declaration for Florida, meaning the Federal Emergency Management Agency (Fema) will help state agencies with the relief effort.
What happened in Miami?
A large section of the oceanfront Champlain Towers in Surfside crumbled to the ground at about 01:00 (05:00 GMT) on Thursday.
Resident Barry Cohen was in bed when the building started to collapse. "It sounded like thunder, and my wife and I, we went out on the balcony; it looked like a bomb had exploded," he told the BBC.
"When we opened the door, there was no building there, it was just a pile of rubble," he said.
Eyewitnesses described hearing what sounded like thunder before seeing a huge cloud of dust in the aftermath of the collapse. One compared the scene to the 11 September 2001 attacks on the Twin Towers in New York.
The BBC's Will Grant at the scene says the collapse has left children's bedrooms visible: "It's a very disturbing sight."
Search teams on Thursday night detected sounds of banging and other noises, but no voices coming from the tonnes of debris. Constant rain and storms are further complicating an already difficult task for the search-and-rescue teams.
Authorities have begun taking DNA samples from relatives of those missing in case only remains of their family members are found in the rubble.
Relatives of the missing have gathered to wait for news. They have been putting out appeals on social media for information that could help them find their loved ones.
Families anxiously wait for news
BBC's Will Grant in Miami
In the cool of the early evening, a handful of families and neighbours appeared on the beach nearest to the collapsed building to light candles and lay flowers. Others stood in mute reflection as the full gravity of what happened in this small seaside community is now becoming clear.
It was a sharp contrast to the activity at the site all day where search and rescue teams have kept up their momentum despite torrential downpours and other setbacks. For long periods, thick acrid smoke billowed from the collapsed building as sporadic fires broke out in the wreckage.
And through it all, the teams have kept searching for survivors.
Most families are hanging on to the hope that there are still people inside the debris and that their missing loved one might, somehow, be pulled out alive soon. Yet many are well aware the chances of such an outcome are getting slimmer by the hour.
The family reunification centre has been moved from a community centre near the destroyed building to a hotel slightly further away. But the scene is much the same: relatives sit - anxious and tearful, holding hands, desperate for a positive update.
So far, none has been forthcoming.
What caused the collapse?
It remains unknown. A full investigation will begin after the rescue mission.
As the building has stood since 1980, it was due its standard 40-year review. The building was undergoing its "recertification" process and required repairs, officials said.
Kenneth Direktor, a lawyer involved in the work, was quoted in the New York Times saying engineers had identified rusted steel and damaged concrete that needed repairing, but added that he saw nothing to suggest the collapse had anything to do with that review.
A study from researchers at Florida International University published last year found that the building had been sinking at a rate of two millimetres per year in the 1990s, which may have affected the building structurally.
But the author has cautioned that the study was just a snapshot in time. The building was constructed on reclaimed wetland, which experts say is always of concern as the land underneath can compact over time, leading to shifts.
On the sinking, the author of the study, Prof Shimon Wdowinski, told the Miami Herald newspaper: "We've seen much higher than that, but it stood out because most of the area was stable and showed no subsidence."
Prof Wdowinski said the research is not meant to suggest certainty about the latest incident.
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2021-06-26 04:08:05Z
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