At least 168 people have been killed and 745 injured after a tsunami hit coastal towns on Indonesia's Sunda Strait, government officials say.
The tsunami waves struck at night without any warning, destroying hundreds of buildings.
Officials say the tsunami could have been caused by undersea landslides after Anak Krakatau volcano erupted.
The Sunda Strait, between the islands of Java and Sumatra, connects the Java Sea to the Indian Ocean.
What is the latest?
The disaster management agency has warned people to stay away from the coastline due to fears of another tsunami.
Saturday's tsunami struck at about 21:30 local time (14:30GMT), hitting several beaches including the popular Tanjung Lesung beach resort in the west of Java island.
Deaths have been reported in the Pandeglang and Serang on Java, and Lampung province on Sumatra. Officials fear the death toll could rise further.
The BBC's Rebecca Henschke in Indonesia said there were reports that the death toll in Lampung province alone could be in the hundreds.
Footage shared on social media showed a large wave crashing into a tent in the resort, in which a popular Indonesian rock band, Seventeen, was performing. Members of the band were seen being swept away as the wave destroyed the stage.
In a tearful Instagram video, singer Riefian Fajarsyah, said the band's bassist and road manager had died, and that three other band members and his own wife were missing. (BBC)