At least 408 people have been confirmed dead after a tsunami triggered by a powerful earthquake hit Indonesia's western Mentawai Islands earlier this week, but officials say the death toll could be much higher.
Harmensyah, the head of the West Sumatra provincial disaster management centre, said on Friday that rescue teams "believe many, many of the bodies were swept to sea".
Bodies have also been found buried on beaches and even stuck in trees across the islands.
More than 400 people are believed to be still missing after three-metre high waves battered the small group of islands, about 280km to the northwest of Sumatra, on Monday.
"Of those missing people, we think two-thirds of them are probably dead, either swept out to sea or buried in the sand," Ade Edward, a local disaster management official, said on Thursday.
"When we flew over the area ... we saw many bodies. Heads and legs were sticking out of the sand, some of them were in the trees. If we add another 200 to the toll it would be at least 543 dead.Read more