NEW YORK, Dec. 1 (UPI) -- U.S. military prosecutors reportedly have convinced a judge to keep secret the identity of witnesses against a detainee held at Guantanamo. "It is conceivable, if not likely, that al-Qaida members or sympathizers could attempt to target witnesses," Marine Maj. Jeffrey D. Groharing wrote to the judge, Army Col. Peter E. Brownback III, The New York Times reported Saturday. Brownback has ordered defense lawyers preparing for the war crimes trial of Omar Ahmed Khadra, 21, not to tell anyone, including Khadra, the identity of the witnesses, the Times reported.