The leading suspect is the Benghazi militia, Ansar al-Shariah. The group denies responsibility for the attack but has ties to al-Qaida in the Islamic Maghreb. Some of its leaders and fighters were spotted by Libyan locals at the consulate during the violence, and intelligence intercepts show the militants were in contact with AQIM militants before and after the attack.
U.S. intelligence is working to identify the faces of attackers recorded on security cameras during the attack.
There is plenty of the fog of war Secretary of State Clinton spoke of to go around. Intelligence officers and special operations soldiers had no trouble determining that this was a professional hit from the earliest reports. This was not a confused situation at all and the Department of State and the CIA had access to fifty or so eye witnesses after the evacuation. Troubling official statements continue.