Libyan security officials say the U-S Ambassador to Libya was killed in Tuesday's attack on the US Consulate in Benghazi.
Ambassador Christopher Stevens was reportedly leaving the Consulate, after it was stormed by demonstrators angry over an anti-Muslim film posted on the internet.
Libyan officials said the Ambassador's Convoy was hit by rocket fire.
Three other Embassy staffers were also killed. Their nationalities are unknown at this time.