Brad Adams, Asia Director of the US-based Human Rights Watch, said, "The government has been keeping 11,000 people in a legal limbo for months."
Adams claimed that the Sri Lankan government has routinely violated the fundamental rights of the detainees.
Adams said that the lack of transparency on the issue raises concerns about possible torture of those in custody.
"It's time to identify who presents a genuine security threat and to release the rest," Adams said after the release of a 30-page report 'Legal Limbo: The Uncertain Fate of Detained LTTE Suspects in Sri Lanka.'
The report is based on interviews with the detainees' relatives, humanitarian workers and human rights advocates, among others.