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. 11 attacks 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 said the attackers "may have had foreign loyalties" - an apparent reference to international terrorists.
Libyan authorities have made four arrests in the investigation into the attack on the U.S. consulate, reported CBS News.
"Four men are in custody and we are interrogating them because they are suspected of helping instigate the events at the U.S. consulate," Wanis el-Sharef, eastern Libya's deputy interior minister, told Reuters.
U.S. officials also said that the Pentagon is moving two warships to the Libyan coast, in the aftermath of the attack in Benghazi.
Officials said that one destroyer, the USS Laboon, moved to a position off the coast Wednesday, and the USS McFaul is en route and should be stationed off the coast within days. The officials say the ships, which carry Tomahawk missiles, do not have a specific mission. But they give commanders flexibility to respond to any mission ordered by the president.
The destroyers have crews totaling about 300. There have been four destroyers in the Mediterranean for some time. These moves will increase that to five.
Officials spoke on condition of anonymity because they were not authorized to publicly discuss troop movements.
President Barack Obama has vowed to bring to justice those responsible for the Benghazi attack, which U.S. officials said may have been planned in advance. Secretary of State Hillary Clinton said Washington had nothing to do with the video, which she called "disgusting and reprehensible".
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