Gunman killed after shooting 2 Pentagon police

Pentagon Police officers patrol the perimeter as law enforcement officials meet at the Pentagon Metro complex where a man with a gun opened fire in Washington, Thursday, March 4, 2010. A gunman coolly drew a weapon from his pocket and opened fire at the teeming subway entrance to the Pentagon complex, wounding two police officers before being shot and critically wounded, officials said., Thursday, March 4, 2010. (AP Photo/Cliff Owen)

March 5, 2010 12:39:32 PM PST
The man who opened fire in front of the Pentagon had a history of mental illness and had become so erratic that his parents reached out to local authorities weeks ago and warned them that their son was unstable and might have a gun, authorities said Friday.