Death toll from Java asylum seeker boat tragedy rises as police hunt smuggler

The death toll from last week's asylum seeker boat tragedy off Indonesia has risen to 20 as authorities look for a man thought to be responsible.

Indonesian police are searching for an Indian man who is thought to have organised the fatal voyage.

The boat sank a week ago in rough seas off Cidaun, on the south-west Java coast.

So far 189 survivors have been found and 20 bodies have been recovered with another five retrieved in the past two days.

Police have already arrested four Indonesian men who are accused of having various roles including helping the passengers onto the boat and coordinating its departure.

Authorities are now looking for a man from India who allegedly recruited passengers at immigration detention centres and organised the crossing to Australia.