Terrorists in Benghazi, Libya, "essentially walked right into the Benghazi compound unimpeded and set it ablaze," a special Senate report on the September 11 attack that killed a U.S. ambassador and three other Americans says.

The bipartisan report, "Flashing Red: A Special Report on the Terrorist Attack at Benghazi," released Monday by the Senate Committee on Homeland Security and Government Affairs, cites "extremely poor security in a threat environment that was 'flashing red.' "

The State Department comes in for the major portion of blame for failing to respond to, even ignoring, repeated requests from U.S. staff in Benghazi for more security resources, especially more personnel.