September 17th, 2013
10:30 PM ET

Navy Yard gunman's red flags overlooked prior to D.C. massacre

As investigators piece together Aaron Alexis' history, the big question: how did the shooter, a man with a history of mental health issues, arrests and gun violations get and keep the security clearance needed to enter the Washington Navy Yard.

Navy Yard gunman's psychological issues, motive focuses after shooting

Drew Griffin has the latest in this Outfront investigation.

Filed under: Navy Yard Shooting • News
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