It may have been more than just an out-of-control angry mob.

Washington is now looking at whether the killing of the US ambassador to Libya was a planned terrorist attack to mark the anniversary of 9-11.

The assault was initially believed to be prompted by anger over an anti-Islamic movie.

But a counterterrorism source says intelligence officials now see it as too highly-coordinated to have been spontaneous.

 U.S. officials are saying the Pentagon is moving two warships to the Libyan coast.

Officials say 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 totalling 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.

(The Associated Press)