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The report tries to correct some of the narrative that has emerged since the attack. For example, committee members said that contrary to reports, the U.S. was not the only country to keep its mission in Benghazi open during the summer of 2012 — a claim some administration critics made in questioning why the American outpost remained in such a dangerous place.

The report also clears the military of a number of accusations, including that commanders blocked a relief effort and failed to get assets moving quickly enough. Investigators concluded that troops or aircraft that could have helped in that kind of situation were stationed too far away to come to the rescue.

In one stark revelation, the investigators said Gen. Carter Ham, who was in charge of U.S. Africa Command at the time, offered Mr. Stevens more security by extending the deployment of a military site security team.

The State Department had declined the extension, but Gen. Ham, after reading intelligence warnings, twice asked Mr. Stevens whether he wanted the site security team to remain. The ambassador declined both offers.

Republicans on the committee joined in the report’s conclusions but submitted an addendum saying the findings didn’t go far enough.

The Republican senators said the administration is still stonewalling a request for some documents and that some State Department officials involved in decision-making have refused to testify.

Others gave testimony that contradicted written documents or, in the case of Undersecretary of State for Management Patrick Kennedy, gave testimony that the senators said “was particularly specious.”

“The Obama administration was more of a roadblock than a contributor,” said Sen. Marco Rubio, Florida Republican and intelligence committee member.

Republicans also criticized the report for not paying more attention to the role of White House and State Department officials who pushed the intelligence community to blame protests rather than a coordinated terrorist assault.

“It is baffling how a fundamental, unclassified fact that was known to the [intelligence community] from the beginning was only communicated clearly to the American people by the administration after the issue had already been sufficiently muddled to result in confusion,” said Sen. Susan M. Collins, Maine Republican and a member of the committee.