Investigators were looking Friday into the history of a man who they say shot two police officers at the Pentagon on Thursday evening before being fatally wounded.
The officers shot back and hit the man, who died early Friday. The officers suffered non-life-threatening injuries.
Pentagon Police Chief Richard S. Keevill said that surveillance video shows the gunman acted alone.
The shooter, identified by a law enforcement source as John Patrick Bedell, appears to be a man who had railed against the government repeatedly on the Internet.
Through podcasts and a Wikipedia page, a man identified online as JPatrickBedell cast the government as a criminal force destroying personal liberties.