The "Imprisoned Omar Abdel Rahman Brigades" wanted/wants the release of the Blind Sheik, Omar Abdel Rahman, who is imprisoned in North Carolina. The Brigades attacked the International Red Cross office in Benghazi in August, and two month earlier, June 2012, detonated a bomb outside the Benghazi Consulate office where Ambassador Stevens was murdered on September 11th. That bombing was in retaliation for the death-by-drone of al-Qaeda's second-in-command, Abu Yahya al Libi (read it here at CNN, dated June 6, 2011). There was damage to glass on the front of the Consulate, but no injuries. Leaflets left at the bombing site...