FILE - In this Thursday, Sept. 13, 2012 file photo, a Libyan man explains that the bloodstains on the column are from one the American staff members who grabbed the edge of the column w

 

              FILE - In this Thursday, Sept. 13, 2012 file photo, a Libyan man explains that the bloodstains on the column are from one the American staff members who grabbed the edge of the column w
FILE - In this Thursday, Sept. 13, 2012 file photo, a Libyan man explains that the bloodstains on the column are from one the American staff members who grabbed the edge of the column while he was evacuated, after an attack that killed four Americans, including Ambassador Chris Stevens on the night of Tuesday, Sept. 11, 2012, in Benghazi, Libya. Witness accounts gathered by The Associated Press give a from-the-ground perspective for the sharply partisan debate in the U.S. over the deadly incident. They corroborate the conclusion largely reached by American officials that it was a planned militant assault. But they also suggest the militants may have used a film controversy as a cover for the attack. (AP Photo/Mohammad Hannon)