Hundreds of suspects arrested in Pakistan as part of the "War on Terror" have disappeared after being taken into custody, according to Amnesty International.
In a report, the human rights organisation claims that many suspects are tortured and sold into US custody by bounty hunters.
It is alleged some of those tortured include children, and suspects are routinely transferred illegally to Guantanamo Bay and Bagram Airbase in Afghanistan, as well as other secret locations around the world.
The organisation says US operatives are involved in some of the arrests.
Amnesty is calling on Pakistan President Pervez Musharraf to reveal the fate of the "disappeared" and calls for an end to "arbitrary detention."
It is also calling on the President, who is on a visit to Britain, to publish a list of detention centres in Pakistan and register all those held on suspicion of terror offences.