The Australian Security Intelligence Organization (ASIO) has told a group of Sri Lankan detainees that it regards them as a threat to national security because some of them have a history of violence in their homeland.
In a letter obtained by the ABC, ASIO says the group, held in a Melbourne detention centre, remains ideologically supportive of LTTE.
The refugees received the letter 10 days ago.
Since receiving the letters, some of the 50 Sri Lankans have gone on a hunger strike.
The letter is one of many sent to people in detention who had been granted political asylum but had still been held in detention for up to four years.
One Sri Lankan man was assessed as being strongly ideologically supportive of LTTE terrorists and their aim of separate home land through the use of violence.
The letter says ASIO believes he is likely to engage in acts prejudicial to Australia's security if granted a permanent protection visa.