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Questions about Navy Yard Gunman's Security Clearance
WASHINGTON (CBS/AP) -- Police are trying to figure out why a former Navy reservist opened fire and killed 12 people at the Washington Navy Yard .
Co-workers described the 34-year-old as friendly, but investigators say he hada history of run-ins with police and was treated for mental problems.
The FBI searched this Washington, D.C . area hotel looking for answers. It's believed Aaron Alexis stayed there in the days leading up to Monday's shooting.
Witnesses at the Navy Yard say the 34-year-old shot into an atrium full of people, killing 12 of them. He died after a gun battle with police.
Law enforcement officials now say Alexis used a shotgun and two handguns in the assault -- but not an AR-15 assault rifle, as authorities had previously reported. An official says he arrived with the shotgun, and took the handguns away from law officers at the scene.
Alexis was working at the complex on a computer wiring project. Co-workers say he was friendly but authorities discovered a history of behavior problems. He was arrested in 2004 for shooting out a man's tires and again in 2010 for firing a weapon at the ceiling of his apartment.
Officials say Alexis had been hearing voices and was being treated for mental problems in the weeks before the rampage. Still, he was able to keep his security clearance.
The Navy Yard is open again but only to essential personnel. On Monday the complex was locked down and evacuated when the shooting started.
Omar Grant helped a visually impaired co-worker escape. Today he feels lucky to be alive. "I'm here with my family and i'm thinking of those people who aren't"
Tuesday morning, Defense Secretary Chuck Hagel laid a wreath for the victims at the Naval Memorial.
Family members are now in the process of making funeral arrangements.
The shooting is the deadliest on a military installation in the U.S. since the tragedy at Fort Hood, Texas, in 2009
(Information from the Associated Press contributed to this report)