(WTOP) WASHINGTON – Intelligence experts and U.S. government officials are starting to view the attack in Libya that killed U.S. Ambassador Chris Stevens and three others in Benghazi as a coordinated attack.

Sources including officials at the Pentagon and the State Department are discussing the possibility that it was a planned operation, and some say several developments seem to support the possibility.

The incident does not appear to be a random mob scene, but rather an opportunity that militants seized, sources say. The attackers used a rocket-propelled grenade, a weapon not traditionally carried by protesters, but commonly used by terrorists.

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