(Reuters) – The State Department made a “grievous mistake” in keeping the U.S. mission in Benghazi open despite inadequate security and increasingly alarming threat assessments in the weeks before a deadly attack by militants, a Senate committee said on Monday.

A report from the Senate Homeland Security Committee on the September 11 attacks on the U.S. mission and a nearby CIA annex, in which the U.S. ambassador to Libya and three other Americans died, faulted intelligence agencies for not focusing tightly enough on Libyan extremists.

It also faulted the State Department for waiting for specific warnings instead of improving security.

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