Investigation turns to DC gunman’s motive

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Investigators are turning their attention early Tuesday to the question of why Navy veteran Aaron Alexis killed 12 people at a Navy building in Washington Monday morning.

Alexis, 34, who was discharged from the Navy two years ago after serving hitches in Texas and Illinois, sprayed bullets from the fourth floor down to the cafeteria area in the Naval Sea Systems Command headquarters in southeast Washington in an attack that began just after 8 a.m. Alexis died later as he traded shots with responding police, although it was unclear if he killed himself or was brought down by cops.

At a late night news conference Monday, Metropolitan Police Chief Cathy Lanier said she was confident that Alexis was the “single and sole person responsible” despite earlier reports of a possible second shooter.

Washington Mayor Vincent Gray said there was still no motive for the shootings and no indication of terrorism “although we haven’t ruled that out.”

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