(MCT) — WASHINGTON — The scandal that forced spy chief David H. Petraeus to resign has diverted attention from another problem for the CIA: why the agency failed to anticipate or repel the Sept. 11 attack in Benghazi, Libya, that killed two CIA contractors, as well as the U.S. ambassador and another American.

Four House and Senate committees are holding closed hearings this week to examine security arrangements during the assault by armed militants. They will also look at the Obama administration’s public response.