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A state of emergency has been declared in southern Iceland because of another volcanic eruption on the Reykjanes Peninsula - the fourth since December.
It is thought to be the most powerful flare-up so far. Lava has reached the eastern defences around the evacuated town of Grindavik, local media said.
People have also been moved from the nearby Blue Lagoon, one of Iceland's most popular tourist attractions.
Iceland's airspace remains open. A giant lava spill is billowing smoke.
According to the country's civil defence service, the eruption began after 20:00 local time (20:00 GMT) on Saturday, north of Grindavik.
This is a similar location to the eruption that began on 8 December.
Footage of the explosion showed clouds of smoke and glowing magma oozing and bubbling from vents in the earth.
The explosion has not affected the main international airport, which lies to the north-west of Grindavik.
Geophysicist Magnus Tumi Gudmundsson, who was among those to fly over the affected areas in a helicopter, told local media that Saturday's eruption was the most powerful so far.
Two lava streams have been moving west and south. Local media reported that lava from the latter had reached Grindavik's eastern defence walls.
Mr Gudmundsson said it was also possible lava could flow into the sea, but that this may not happen if the volcanic activity eases.
Einar Bessi Gestsson, a natural disaster expert at the Norwegian Meteorological Agency, has told Iceland's public broadcaster RUV that dangerous gases and small explosions could occur if lava makes contact with sea water.
Meanwhile, the lava moving west is heading in the direction of the Blue Lagoon and a geothermal power plant, which provides hot water for most of the Reykjanes Peninsula.
The Icelandic Met Office said this lava bed was "significantly wider" than in February, when an earlier eruption caused lava to flow in a similar direction.
Many protective embankments have been built around both, the head of the Reykjavik-based Nordic Volcanological Centre, Rikke Pedersen, told Reuters.
There are concerns that fibre optic cables on the road could be damaged - causing disruption to phone and internet services.
The Blue Lagoon is closed until further notice as a precaution. There were between 500-600 people in the area when Saturday's eruption happened, Ms Pedersen said.
Between five and 10 homes in Grindavik were also cleared.
The town's roughly 4,000 residents were only allowed to return to their homes about a month ago after an eruption in January saw magma spread into the town, destroying three homes.
Most of them have chosen not to return.
Iceland has 33 active volcano systems and sits over what is known as the Mid-Atlantic Ridge, the boundary between two of the largest tectonic plates on the planet.
The last time the Reykjanes Peninsula had a period of volcanic activity was 800 years ago - and the eruptions went on for decades.
This is now the seventh eruption since 2021, and scientists believe the area is entering a new volcanic era that could last for decades or even centuries.
https://news.google.com/rss/articles/CBMiMGh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL3dvcmxkLWV1cm9wZS02ODU4OTU5NNIBNGh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL3dvcmxkLWV1cm9wZS02ODU4OTU5NC5hbXA?oc=5
2024-03-17 07:23:59Z
CBMiMGh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL3dvcmxkLWV1cm9wZS02ODU4OTU5NNIBNGh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL3dvcmxkLWV1cm9wZS02ODU4OTU5NC5hbXA
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