“We can confirm that police in Tonga have informed us of two deaths, one of them a British national,” the New Zealand Department of Foreign Affairs and Trade said.

The brother of the 50-year-old woman from Great Britain has already confirmed his sister’s death in British media on Monday. She is said to have died trying to save her dogs from the tsunami that followed the volcanic eruption. The identity of the second victim is not yet known.

Communications in Tonga have been largely cut off, so the exact damage to the islands is not yet clear. How long it will take to restore the means of communication is also uncertain. Australia and New Zealand have already sent surveillance planes to the island nation on Monday to check for damage.

Saturday’s eruption was so large that it was measurable everywhere on Earth with a difference in air pressure. At least two more people were killed in Peru, 10,000 kilometers from Tonga. The women drowned due to the abnormally high waves caused by the tsunami after the eruption of the volcano. An oil spill also arose off the Peruvian coast. The waves caused a ship to wreck and spill oil, forming a patch of more than 2 km along the coast.