Three people were killed and 33 missing after an Indonesian ferry capsized, reports said on Friday.
The Tristra I ferry was carrying 58 people between Sumatra and Bangka islands when it capsized on Thursday, the detikcom news portal said.
"The ship's position is upside down," it quoted marine police officer Sulistiono as saying.
ElShinta radio reported 22 people had been rescued so far.
Westerly monsoon winds which usually create high waves were thought to be the cause of the accident, detikcom said.
"The surf is still very high now," said Sulistiono.
Tristra I had the capacity to carry 108 people and 17 cars.
Ferries are a crucial link between the archipelago nation's 17,000 islands and frequently carry more people than officially acknowledged. Boats are also often overloaded due to lax safety standards.