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September 17, 2013 4:32 PM

Aaron Alexis’ characteristics mirrored those of mass shooters

What are the factors that motivate a mass shooter? Washington Navy Yard shooting suspect Aaron Alexis had several characteristics common among mass killers, experts say: aggression, difficulties on the job, paranoia and anger problems. Alexis reportedly went on a rampage Monday, killing 12 people in a commando-style attack at the Navy Yard, where he was beginning work as a civilian contractor.

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