WASHINGTON -- U.S. investigators are looking into whether the deadly attack on a U.S. consulate in Libya was a coordinated terrorist assault to mark the anniversary of the Sept. 11attacks and not just spontaneous mob violence triggered by an anti-Islam video on YouTube.
Ambassador Chris Stevens and three other Americans were killed when an armed mob stormed the U.S. consulate in Benghazi Tuesday and set it ablaze.
The speaker of Libya's Parliament says the attackers "may have had foreign loyalties" - an apparent reference to international terrorists.
President Barack Obama says the U.S. will work with the Libyan government to find those responsible and vows: "Justice will be done."
Fifty U.S. Marines are headed to Libya to reinforce security at the American embassy in Tripoli, while the Pentagon is moving two warships to the Libyan coast. Officials say the ships, which carry Tomahawk missiles, give commanders flexibility to respond to any mission ordered by the president. Pentagon spokesman George Little says the U.S. military "regularly takes precautionary steps" in such situations.