A 15-metre (49-foot) tsunami unleashed by a huge volcanic blast crashed ashore on Tonga last week, demolishing homes and killing at least three people, the island state's government has said.

In an "unprecedented disaster", one village was completely wiped out while only a few houses remained standing in several other settlements scattered across the archipelago, the government said in its first public statement on Saturday's disaster.

At least three people were killed and survivors were left huddled under makeshift shelters, it said.

"An unprecedented disaster hit Tonga," the government said Tuesday following the violent eruption of the Hunga-Tonga-Hunga-Ha'apai volcano.

Rescue teams have been sent to the worst-hit areas to evacuate residents, it said.

The government said the eruption triggered a tsunami "rising up to 15 metres" which slammed ashore on the west coast of several islands.

The village on Mango island, where a distress beacon was detected earlier in the week, was completely destroyed while only a few houses remained standing in several other villages scattered through the archipelago.

A 65-year-old woman in Mango was one of three people confirmed dead along with a 49-year-old man and British national Angela Glover.

Multiple injuries were also reported, the government said.

Tongan navy vessels carrying health workers and laden with urgent supplies of water, food and tents were being deployed.

"The evacuation process has begun," the government statement said.

Aid efforts have been hampered by a fault in the undersea cable connecting Tonga to the rest of the world, with communication to the outer islands limited to satellite phones and radio.

Photos taken by a New Zealand Air Force reconnaissance flight showed a thick volcanic-ash blanket covering the islands which had contaminated supplies of drinking water.

There were also issues with aid arriving from overseas, with damage to wharves and ash on the main airport runway preventing international arrivals.

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Images reveal devastation in tsunami-hit Tonga
Wellington (AFP) Jan 18, 2022
A volcano that exploded in the Pacific island nation of Tonga has almost disappeared from view, new images revealed Tuesday, with swathes of the country smothered in grey dust or damaged by a tsunami. The volcano erupted 30 kilometres (19 miles) into the air on Saturday and deposited ash, gas and acid rain across a large area of the Pacific. In the tsunami that followed, waves in Tonga rose up to 15 metres (50 feet), its government said in a statement. Three people were killed and "a number ... read more