NEW YORK, Aug 4: Three British prisoners released from Guantanamo Bay levelled accusations of systematic abuse on Wednesday in a lengthy report that civil rights groups said exposed the military facility as "a legal black hole".

The 115-page report detailed incidents of sexual and religious humiliation, as well as brutal interrogation methods that induced false confessions. "What this shows is that you can't trust at all the information coming out of Guantanamo," said Michael Ratner, president of the Center for Constitutional Rights.

"This is a chilling, chilling document ... of what can happen when an administration decides to leave law behind and run an interrogation camp that they say is a law-free zone," Ratner said.

Asif Iqbal, Ruhal Ahmed and Shafiq Rasul, from Tipton, England, were detained in Afghanistan in Nov 2001. They were released without charge in March after more than two years in custody - most if it at the US military base in Guantanamo Bay, Cuba.

Copies of the report were sent on Wednesday to Senator John Warner, chair of the US Senate Armed Services Committee. Rasul and Iqbal detailed their confinement in open cages in the sweltering Cuban heat, with many prisoners suffering bites and stings from the snakes and scorpions allowed to roam the cells.

The men also claimed to have been beaten, shackled in painfully contorted positions, forcibly injected with drugs and deprived of sleep. At one point, Iqbal said he was coerced by a female interrogator into admitting that he was one of the people shown in a videotape listening to a speech from Osama bin Laden.

"She said to me, 'I've put detainees in isolation for 12 months and eventually they've broken. You might as well admit it now so that you don't have to stay in isolation'," Iqbal said.

"I was going out of my mind ... Eventually I just gave in and said, "OK it's me'," he added. British intelligence later found that Iqbal was living in Birmingham, England when the tape was made. -AFP