Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past

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Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past

Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past
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Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past

by ABC News Videos 2:36 mins

ABC News' Tahman Bradley says investigators are checking into how Alexis kept his security clearance

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