Tonga tsunami: Before and after eruption
By The Visual Journalism Team
BBC News
The massive volcanic eruption and tsunami in Tonga has caused catastrophic damage, with homes destroyed and many communities covered in a thick layer of ash.
The Tongan government says the country has been hit by an "unprecedented disaster".
Communications with Tonga have been severely disrupted.
Satellite images and aerial photographs show the scale of the destruction.
The single undersea cable connecting Tonga to the outside world was severed in the eruption.
The port in the capital, Nuku'alofa on the main island of Tongatapu, has been severely damaged, with many buildings near the waterfront completely flattened.
Reports from the area say 56 houses were completely or seriously damaged, and that the residents have been moved to evacuation centres.
There is also growing concern for residents of smaller, low-lying islands to the north of Tongatapu.
New Zealand is sending two ships, HMNZS Wellington and HMNZS Aotearoa, to the area with water supplies, survey teams and a helicopter.
Little appears to be left of Hunga-Tonga-Hunga-Ha'apai, where the volcanic eruption happened on Saturday. Satellite images show only a small amount of land remains above water.
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