WASHINGTON – Three State Department officials resigned under pressure Wednesday, less than a day after a damning report blamed management failures for a lack of security at the U.S. diplomatic mission in Benghazi, Libya, where militants killed the U.S. ambassador and three other Americans on Sept. 11.

The resignations came as lawmakers expressed anger and frustration over the findings of an independent review panel, and the State Department struggled to find a balance between protecting its diplomats while allowing them to do their jobs connecting with people in high-risk posts.

Obama administration officials said those who had stepped down were Eric Boswell, the assistant secretary of state for diplomatic security, Charlene Lamb, the deputy assistant secretary responsible for embassy security, and Raymond Maxwell, the deputy assistant secretary of state who oversees the Maghreb nations of Libya, Algeria, Tunisia and Morocco.