A massive volcanic eruption in Tonga that triggered tsunami waves has smothered the Pacific islands in ash, cut power and severed communications.
Up to 80,000 people there could be affected, the International Federation of Red Cross and Red Crescent Societies (IFRC) told the BBC.
New Zealand Prime Minister Jacinda Ardern said the tsunami had wreaked “significant damage”, washing boats ashore and battering beachside shops.
No deaths have been reported so far.
Information remains scarce, however, and New Zealand and Australia are sending surveillance flights to assess the extent of the damage.
Katie Greenwood of the IFRC in Fiji said that help was urgently needed.
“We suspect there could be up to 80,000 people throughout Tonga affected by either the eruption itself or from the tsunami wave and inundation as a result of the eruption,” she said.
“That was a shock to people, so we do hold some concern for those outer islands and we’re very keen to hear from people.”
The underwater volcano erupted on Saturday, sending a plume of ash into the sky and triggering warnings of 1.2m (4ft) waves reaching Tonga. The eruption was so loud it could be heard in New Zealand, some 2,383km (1,481 miles) from Tonga.
Locals say Tonga looks “like a moonscape” after being coated in a layer of volcanic ash.
The dust was reportedly contaminating water supplies and making fresh water a vital need, Ms Ardern said on Sunday.
Aid charities said the ash had prompted authorities to tell people to drink bottled water and wear face masks to protect their lungs.
As the sky darkened with ash, videos showed traffic jams as people fled low-lying areas by car. Hours later, Tonga’s internet and phone lines went down, making the island’s 105,000 residents almost entirely unreachable.
Prior to the largest eruption, the volcano had been erupting for several days. The Tonga Meteorological Agency had warned that the smell of sulphur and ammonia was being reported in some areas.
Ms Ardern said power was being restored to some parts of the island and mobile phones were slowly starting to work again. But the situation in some coastal areas remained unknown.
Unable to speak to their friends and family, many Tongans in Australia and New Zealand have grown concerned for their safety.
Fatima said she had not heard anything from her colleague who runs a seafront restaurant in Tonga’s capital Nuku’alofa.
“It’s all very sad, we are hoping for the best,” she told the BBC. “This will hit them so hard as they have been in lockdown a long time with no tourists visiting and now this.”
Satellite images suggest some outlying islands have been completely submerged by seawater.
Experts say the eruption of the Hunga-Tonga Hunga-Ha’apai volcano is one of the most violent in the region in decades.
It triggered tsunami warnings in several countries, including Japan and the US, where flooding hit some coastal parts of California and Alaska.
UK Foreign Office minister Zac Goldsmith called the situation in Tonga “shocking” and said Britain stood “ready to help and support our Commonwealth friend and partner in any way we can”.
Prior to the largest eruption, the volcano had been erupting for several days. The Tonga Meteorological Agency had warned that the smell of sulphur and ammonia was being reported in some areas.
Ms Ardern said power was being restored to some parts of the island and mobile phones were slowly starting to work again. But the situation in some coastal areas remained unknown.
Unable to speak to their friends and family, many Tongans in Australia and New Zealand have grown concerned for their safety.
Fatima said she had not heard anything from her colleague who runs a seafront restaurant in Tonga’s capital Nuku’alofa.
“It’s all very sad, we are hoping for the best,” she told the BBC. “This will hit them so hard as they have been in lockdown a long time with no tourists visiting and now this.”
