“He immediately alerted the QRF [Quick Response Force] at the Annex and at the embassy in Tripoli by cell phone. His message was short and to the point: “Benghazi under fire, terrorist attack.” Nothing more needed to be said.”
The authors go on to describe hallmarks of a pre-planned attack:
It was clear that whoever the men assaulting the compound were, they had been given precise orders and impeccable intelligence. They knew when, where and how to get from the access points toward the ambassador’s residence and how to cut off the DS agents as well as the local guard force and the February 17 Brigade militiamen on duty that night…The attackers had known that there were new, uninstalled generators behind the February 17 command post, nestled between the building and the overhand of foliage from the western wall, as well as half a dozen jerry cans full of gasoline to power them.
Twenty-five minutes after the attack began, word of it reached the State Department in Washington and 35 other recipients including DOD, AFRICOM, the FBI and many others.
The State Department knew with in minutes it was a terrorist attack – they knew months prior they weren’t prepared; http://hotair.com/archives/2013/09/04/report-state-dept-knew-of-benghazi-vulnerabilities-ignored-them/