Four Americans were killed during the attack: information officer Sean Smith, security staffers Tyrone Woods and Glen Doherty, and U.S. Ambassador Christopher Stevens.

WSJ: Obama's Scandalous Legacy

Three people -- Stevens, Foreign Service information management officer Sean Smith and a U.S. security officer -- were inside at the time, according to the senior administration officials who briefed reporters Wednesday afternoon.

CNN: U.S. vows to hunt down perpetrators of Benghazi attack