A Saudi Arabian detainee said by the US military to have been a bodyguard for Osama bin Laden has been repatriated from Guantanamo Bay after more than a decade behind bars, the Pentagon said Tuesday.

"On June 15, a Periodic Review Board... determined continued law of war detention of Abdul Shalabi does not remain necessary to protect against a continuing significant threat to the security of the United States," Pentagon press secretary Peter Cook said.