Flowers, flags and a child's drawing are pictured at a makeshift memorial outside the Navy Yard two days after a gunman killed 12 people before police shot him dead, in Washington, September 18, 2013. U.S. lawmakers are calling for a review into how Aaron Alexis, the suspected shooter in Monday's rampage at the Washington Navy Yard, received and maintained a security clearance, despite a history of violent episodes. REUTERS/Jonathan Ernst (UNITED STATES - Tags: MILITARY CRIME LAW TPX IMAGES OF THE DAY)
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