A number of Arabic and Pashtu interpreters at the terror-war  detention center at Guantanamo Bay are under active investigation for omitting  valuable intelligence from their translations of detainee interrogations, among  other security breaches.
This could taint some of the evidence at the "9/11  trial" in New York and proceedings against other detainees. Remarkably, the Pentagon never cleaned up the "mole infestation" at its  highest-security facility after the FBI busted a Muslim spy ring at Gitmo in  2003.
 The 2003 probe involved at least two Arabic interpreters with high-level  security clearance. Senior Airman Ahmad al-Halabi, a Syrian native, and former  Army linguist Ahmed Mehalba, an Egyptian native, were later convicted of  stealing or mishandling classified documents.
Six years later comes a new problem with Muslim personnel who have  virtually unfettered access to detainees and intelligence at Gitmo. Professional  military security and intelligence officials at Gitmo did the preliminary probe,  then prepared a classified summary and are now briefing top officials and  members of Congress in Washington.
An active FBI criminal probe is also under  way. The possible new spy ring involves several Arabic linguists, some also  Egyptian and Syrian immigrants. They're suspected of, among other things:
 * Omitting valuable intelligence from their translations of  interrogations.
* Slipping notes to detainees inside copies of the Koran.
* Coaching detainees to make allegations of abuse against interrogators.
* Meeting with suspects on the terror watchlist while back in the United  States.
Officials say some of the suspected "dirty" linguists -- who met  privately in a locked mosque at Gitmo -- have had access to 9/11 mastermind  Khalid Sheik Mohammed and other high-value al Qaeda detainees.
"Three years of investigations have revealed the presence of  pro-jihad/anti-Western activities among the civilian-contractor and  military-linguist population serving Joint Task Force Guantanamo," states a copy  of a classified Gitmo briefing, prepared in May for the FBI, CIA and Congress'  intelligence committees....