Indonesia says the 78 Sri Lankan asylum seekers moored in a boat off Sumatra must co-operate with authorities over identity checks or risk expulsion.
The Sri Lankans were intercepted in Indonesian waters eleven days ago while trying to reach Australia.
Australia and Indonesia agreed to a deal last week which in principle would see the asylum seekers moved to an Indonesian detention centre.
But the Sri Lankans, ethnic Tamils, are refusing to leave the ship.
'No choice'
Indonesia's foreign ministry spokesperson Teuku Faizahsyah has told the BBC that Indonesia will only be able to host the 78 Sri Lankan asylum seekers once they have been clearly identified.
http://news.bbc.co.uk/2/hi/asia-pacific/8331300.stm