The incident occurred on the 11th anniversary of the 9/11 attacks as crowds gathered across the United States in somber remembrance of a day that left nearly 3,000 people dead . Four U.S. personnel , including ambassador , are killed in Libya , the U.S. says . Angry protesters attack U.S. diplomatic compounds in Egypt and Libya . The protests spread to other Arab countries.
Four U.S. personnel , including ambassador , are killed in Libya , the U.S. says . Angry protesters attack U.S. diplomatic compounds in Egypt and Libya . The protests spread to other Arab countries.