This report documents the cases of three Yemeni nationals who had "disappeared" in 2003 and who had been kept in isolation in a series of secret detention centres apparently run by US agents. In May 2005 they were flown to Yemen and transferred to Yemeni custody where they continue to be held without charge or trial. Amnesty International is calling for the release of the three men immediately from detention, or to promptly charge them with a recognizable criminal offence and bring them to trial.