New details about what took place on the night of the Benghazi terror attack more than a year ago may come to light when witnesses who were on the ground during the assault meet with congressional lawmakers later this month.

Three CIA employees who were eyewitness to the attack are expected to testify in a closed-door session before the House Intelligence Subcommittee on Oversight and Investigations during the week of November 11, sources told Fox News on Thursday.

Two State Department security agents who have firsthand knowledge of the Sept. 11, 2012, raid that killed U.S. Ambassador Chris Stevens and three other Americans already has been deposed by the House Oversight and Government Reform Committee.