Mark Skipper Profile: Mark Skipper Events (2) (9:20 a.m.) September 11, 2001: Fire Chief Warns Firefighters at Pentagon that Washington Could be Target for Attack 2001-09-11 (9:36 a.m.-9:39 a.m.) September 11, 2001: Emergency Workers See and Promptly Report Low-Flying Flight 77 Approaching the Pentagon and Crashing 2001-09-11