Navy Yard memorial (10 images)

President Barack Obama and first lady Michelle Obama attend a memorial for the victims of the Washington Navy Yard shooting at the Marine Barracks, September 22, 2013 in Washington, D.C. Twelve people were killed at the Navy Yard by a naval contractor on Monday, September 16, 2013. UPI/Olivier Douliery/Pool

People attend a memorial for the victims of the Washington Navy Yard shooting at the Marine Barracks, September 22, 2013 in Washington, D.C. Twelve people were killed at the Navy Yard by a naval contractor on Monday, September 16, 2013. UPI/Olivier Douliery/Pool

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President Barack Obama and first lady Michelle Obama attend a memorial for the victims of the Washington Navy Yard shooting at the Marine Barracks, September 22, 2013 in Washington, D.C. Twelve people were killed at the Navy Yard by a naval contractor on Monday, September 16, 2013. UPI/Olivier Douliery/Pool

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