Palestinians burn a U.S. flag during a protest against the movie, "Innocence of Muslims," near the United Nations office in Gaza City, Wednesday, Sept. 12, 2012. Muslim anger over perceived Western insults to Islam has exploded several times, most recently in Tuesday's attacks against U.S. diplomatic posts in the Middle East in which U.S. ambassador to Libya Chris Stevens and three other Americans were killed. (AP Photo/Adel Hana)