WASHINGTON -- An independent panel charged with investigating the Sept. 11 attack in Libya that killed a U.S. ambassador and three other Americans has concluded that systematic management and leadership failures at the State Department led to "grossly" inadequate security at the mission in Benghazi.

"Systematic failures and leadership and management deficiencies at senior levels within two bureaus of the State Department resulted in a Special Mission security posture that was inadequate for Benghazi and grossly inadequate to deal with the attack that took place," the panel said.

The report singled out for criticism the Bureau of Diplomatic Security and the Bureau of Near East Affairs, saying there appeared to be a lack of cooperation and confusion over protection at the mission in Benghazi, an eastern Libya city that was relatively lawless after the revolution that toppled strongman Moammar Gadhafi.

Despite those failures, the Accountability Review Board determined that no individual officials ignored or violated their duties, and it recommended no disciplinary action now. But it also said poor performance by senior managers should be grounds for disciplinary recommendations in the future.

The report appeared to break little new ground about the timeline of the Benghazi attack during which Ambassador Chris Stevens, information specialist Sean Smith and two former Navy SEALs were killed. Stevens' slaying was the first of a U.S. ambassador since 1988.

But it confirmed that there was no protest outside the consulate and said responsibility for the incident rested entirely with the terrorists who attacked the mission.

In the immediate aftermath of the attack, administration officials linked it to the spreading protests over an American-made, anti-Islamic film that had begun in Cairo earlier that day. Those comments came after evidence had already pointed to a distinct militant attack.

UN Ambassador Susan Rice appeared on TV talk shows the Sunday after the attack and used the administration talking points linking it to the film. An ensuing brouhaha in the heat of the presidential campaign eventually led her to withdraw her name from consideration to replace Hillary Rodham Clinton as secretary of state in the Obama administration's second term.

The review board determined that there had been no immediate, specific tactical warning of a potential attack on the 11th anniversary of Sept. 11, 2001. However, the report said there had been several worrisome incidents in the run-up to the attack that should have set off warning bells.

The report made 29 recommendations to improve embassy security, particularly at high-threat posts. In an accompanying letter to Congress, Clinton thanked the board for its "clear-eyed, serious look at serious systemic challenges" and said she accepted all the recommendations.

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Women hoping to become deacons ... Out East: Southold Fish Market ... Get the latest news and more great videos at NewsdayTV

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Women hoping to become deacons ... Out East: Southold Fish Market ... Get the latest news and more great videos at NewsdayTV

SUBSCRIBE

Unlimited Digital AccessOnly 25¢for 6 months

ACT NOWSALE ENDS SOON | CANCEL ANYTIME