Flags Flown At Half Staff At The State Department After Ambassador Killed In Libya

WASHINGTON, DC - SEPTEMBER 12: A sign stand outside the U.S. State Department September 12, 2012 in Washington, DC. U.S. Ambassador to Libya J. Christopher Stevens and three other Americans were killed in an attack on the U.S. Consulate in Benghazi, Libya. (Photo by Alex Wong/Getty Images)