Obama vows justice after killings in Libya; Romney criticizes administration

President Obama promised swift justice will be delivered to the people responsible for killing the United States ambassador to Libya and three other Americans during a Sept. 11 assault that Washington officials now believe was a coordinated attack rather than the actions of an angry, spontaneous mob.

Ambassador J. Christopher Stevens was killed, along with Foreign Service Officer Sean Smith and two U.S. Marines, after the American Embassy in Benghazi was set ablaze and fired upon by rocket-propelled grenades and other firearms.