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WASHINGTON, DC - APRIL 15: A U.S. flag flies at half staff on the U.S. Capitol April 15, 2013 on Capitol Hill in Washington, DC. Speaker of the House Rep. John Boehner (R-OH) has ordered to lower the flags after two people were confirmed dead and at least 100 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - APRIL 15: A U.S. flag flies at half staff on the U.S. Capitol April 15, 2013 on Capitol Hill in Washington, DC. Speaker of the House Rep. John Boehner (R-OH) has ordered to lower the flags after two people were confirmed dead and at least 100 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)

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