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Despite those failures, the Accountability Review Board determined that no individual American officials ignored or violated their duties and found no cause for any disciplinary action. The board found that contrary to initial reports, there was no protest outside the mission and blamed the incident entirely on terrorists.

The State Department sent a classified version of the report to lawmakers Tuesday and released an unclassified version later Tuesday. The report makes 29 recommendations to improve embassy security. Secretary of State Hillary Rodham Clinton said she accepted them all.