(Reuters) - Washington authorities questioned on Tuesday how a U.S. military veteran with a history of violence and mental problems could have gotten clearance to enter a Navy base where he killed 12 people before police shot him dead.
The suspect, Aaron Alexis, 34, a Navy contractor from Fort Worth, Texas, entered Washington Navy Yard on Monday morning and opened fire, spreading panic at the base just a mile and a half from the U.S. Capitol and three miles from the White House.
Investigators are still trying to determine the shooter's motive. Alexis had been given clearance to enter the base on the Anacostia River, despite two gun-related brushes with the law and a discharge from the Navy Reserve in 2011 after a series of misconduct issues.
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