By Scott McCabe
A picture of the Navy Yard shooter is emerging of a man with a history of violence and mental health problems, raising questions about how the military contractor was able to obtain a security clearance and semi-automatic guns.
U.S. law enforcement officials told The Associated Press that 34-year-old Aaron Alexis had been treated for paranoia, sleep disorder and heard voices in his head.
That follows revelations that Alexis had several run-ins with police, in Texas and in Washington, in which he fired his weapon, including once in anger.
The investigation has moved into a phase of evidence recovery and information gathering, and could take months, law enforcement officials said.
“The focus is going to be on answering the questions we all have,” said U.S. Attorney Ronald Machen Jr. “How did he have access the weapons, what could have been done to prevent tragedy, and whether anyone else…
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