Three State Department officials, including the diplomatic security chief and his deputy, have resigned over the Sept. 11 attack in Benghazi, Libya, The Associated Press is reporting.

The news follows an independent panel’s scathing report to Congress on Tuesday that found “systemic failures and leadership and management deficiencies” at “senior levels” were to blame for “grossly inadequate” security force at the U.S. mission on the night of the attack.

Ambassador Christopher Stevens and three other Americans died in the attack.

The report didn’t find reason for disciplinary action against any officials but singled out the bureaus of Diplomatic Security and Near Eastern Affairs for criticism, saying its leaders demonstrated a “lack of proactive leadership and management ability in their responses to security concerns” in Benghazi.