Middle East Quartet envoy Tony Blair expressed concern about the "the deteriorating health condition of the four prisoners".

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The appeals court said the U.S. officials should not be held responsible for lawsuits over their conduct, in part because the four prisoners have since been released from custody.

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The attorneys for Shaqif Rasul, one of the four former prisoners, had successfully argued an earlier, separate case that reached the Supreme Court in 2004, the year Rasul was freed and returned to England.

CNN: Court again rejects lawsuit over alleged Gitmo mistreatment

Four of the prisoners died, according to Iqbal.

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The group wants the government of Mali to free four prisoners in exchange for Camatte's release.

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The released prisoners include 73 women, four Turks and a Palestinian, said a member of the IHH's executive board, Huseyin Oruc.

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The second option would allow prisoners sentenced to fewer than six months in prison to vote, or the third option would allow prisoners sentenced to fewer than four years in prison to vote.

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The consultation, which recently ended, set out a number of options, including allowing prisoners who are sentenced to up to four years the right to vote.

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However, the monitors had complained in recent months that they felt vulnerable in the prison, notably because of inadequate security provisions for their tiny (four-man) unarmed teams and lax conditions for the prisoners, such as the use of mobile phones.

ECONOMIST: Showdown in Jericho | The