An independent investigation of the fatal attack on a U.S. diplomatic post in Libya on Sept. 11 found that “grossly” inadequate security and reliance on local militias left U.S. diplomats and other personnel vulnerable, the State Department told Congress on Tuesday.

The review of the assault on the mission in Benghazi, Libya, that killed Ambassador J. Christopher Stevens and three other Americans faulted systemic failures of leadership and management deficiencies at senior levels within two bureaus of the State Department, according to an unclassified version posted on the department’s Web site Tuesday night.

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