The State Department's Accountability Review Board has reported on the killings in Benghazi (emphasis added):
1. The attacks were security related, involving arson, small arms and machine gun fire, and the use of RPGs, grenades, and mortars against U.S. personnel at two separate facilities – the SMC and the Annex – and en route between them. Responsibility for the tragic loss of life, injuries, and damage to U.S. facilities and property rests solely and completely with the terrorists who perpetrated the attacks. The Board concluded that there was no protest prior to the attacks, which were unanticipated in their scale and intensity.
2. Systemic failures and leadership and management deficiencies at senior levels within two bureaus of the State Department (the “Department”) resulted in a Special Mission security posture that was inadequate for Benghazi and grossly inadequate to deal with the attack that took place.
3. Notwithstanding the proper implementation of security systems and procedures and remarkable heroism shown by American personnel, those systems and the Libyan response fell short in the face of a series of attacks that began with the sudden penetration of the Special Mission compound by dozens of armed attackers.
4. The Board found that intelligence provided no immediate, specific tactical warning of the September 11 attacks. Known gaps existed in the intelligence community’s understanding of extremist militias in Libya and the potential threat they posed to U.S. interests, although some threats were known to exist.
5. The Board found that certain senior State Department officials within two bureaus demonstrated a lack of proactive leadership and management ability in their responses to security concerns posed by Special Mission Benghazi, given the deteriorating threat environment and the lack of reliable host government protection. However, the Board did not find reasonable cause to determine that any individual U.S. government employee breached his or her duty.