Guantanamo detainee called '20th Hijacker' of 9/11 repatriated to Saudi Arabia

FILE PHOTO: The United States flag decorates the side of a guard tower inside of Joint Task Force Guantanamo Camp VI at the U.S. Naval Base in Guantanamo Bay, Cuba March 22, 2016. REUTERS/Lucas Jackson/File Photo

(Reuters) - A man accused of being the would-be 20th hijacker in the Sept. 11, 2001 attacks has been repatriated to Saudi Arabia after two decades detained at Guantanamo Bay, the U.S. Department of Defense said on Monday.

Mohammad Mani Ahmad al-Qahtani, 46, was transferred to his native Saudi Arabia after a review board determined in June that he no longer represented a significant threat to U.S. national security, the Defense Department said in a written statement.