Washington/San Juan: The Pentagon's records show inmates were desperate before three committed suicide at a US jail in Guantanamo, a US rights group said.

"These documents are the latest evidence of the desperate and immoral conditions that exist at Guantanamo Bay," American Civil Liberties Union Executive Director Anthony Romero said.

"The injustices at Guantanamo need to be remedied before other lives are lost," he said.

Some 1,000 pages made public include a medical report from April 29, 2003, on a previous suicide attempt with a towel.

The patient was in a "vegetative state" from a brain injury after the hanging, the report said. The medical staff at the US Navy base "most strongly advocated" for the inmate's "earliest return to his home country" noting his "history of depression".

Another of the documents showed that an inmate wanted to write his will, which he was allowed to do. "Death had been entering his mind lately," the report said.

The US military suspended a pretrial hearing at Guantanamo for a Canadian detainee accused of killing a US Green Beret, saying base security personnel must first help investigate the recent deaths of three detainees.