The U.S. military judge overseeing the Guantanamo prosecution of five alleged conspirators in the Sept. 11 attacks has issued an order maintaining secrecy over the defendants’ experiences in clandestine CIA prisons.

The protective order safeguarding classified information in the case was signed on Dec. 6 by the judge, Army Colonel James Pohl, and unsealed on Wednesday.

It is not limited to documents formally labeled “Top Secret” by the CIA or produced by the government, but also prohibits disclosure of the defendants own “observations and experiences” in the secret CIA detention, rendition and interrogation program.

Pohl is the chief judge overseeing the war crimes tribunals established by the United States to try foreign captives on terrorism-related charges at the Guantanamo Bay U.S. Naval Base in Cuba.

The defendants in the 9/11 case, including the alleged mastermind of the hijacked plane plot, Khalid Sheikh Mohammed and four other Pakistani, Yemeni and Saudi captives, face charges that could lead to their execution.

All five were held in secret CIA prisons from the time of their capture in 2002 and 2003 until they were sent to Guantanamo in 2006. All have said they were tortured by their U.S. captors and the CIA has acknowledged it subjected Mohammed to the simulated drowning technique of waterboarding 183 times.

Pohl’s order prohibits public disclosure of any information that would reveal where the defendants were held; the names, identities and physical descriptions of anyone involved in their capture, transfer, detention or interrogation; and details about the interrogation techniques used on them.

Prosecutors had asked for the order and said it was needed to prevent disclosure of information that could cause grave harm to the security of the United States and its allies.

Defense lawyers and civil liberties advocates called it an attempt to conceal torture and censor the defendants’ own memories. They said the CIA made its interrogation techniques public once it disclosed them to the defendants.

The ruling comes as the Senate Select Committee on Intelligence weighs whether to release a 6,000-plus-page report analyzing the CIA detention and interrogation program that was launched after the 9/11 attacks.

The report is expected to shed light on whether torture produced information that led to the discovery of Osama bin Laden’s whereabouts. U.S. special forces killed the al Qaeda leader during a raid at a compound in Abbottabad, Pakistan, in 2011.

(Reuters)