Two days after the deadly Libya terror attack, representatives of the FBI and National Counterterrorism Center gave Capitol Hill briefings in which they said the evidence supported an Al Qaeda or Al Qaeda-affiliated attack, Fox News has learned.

The description of the attack by those in the Sept. 13 briefings stands in stark contrast to the now controversial briefing on Capitol Hill by CIA Director David Petraeus the following day — and raises even more questions about why Petraeus described the attack as tied to a demonstration.

The Sept. 13 assessment was based on intercepts that included individuals, believed to have participated in the attack, who were celebratory — as well as a claim of responsibility.

FBI and NCTC also briefed that there were a series of Al Qaeda training camps just outside of Benghazi, where the attack occurred and resulted in the deaths of four Americans. The area was described as a hotbed for the militant Ansar al-Sharia as well as Al Qaeda in North Africa.

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