President Barack Obama speaks in the Brady Press Briefing at the White House in Washington, Friday, April 19, 2013, regarding the Boston Marathon bombing. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama speaks in the Brady Press Briefing at the White House in Washington, Friday, April 19, 2013, regarding the Boston Marathon bombing. (AP Photo/Charles Dharapak)
President Barack Obama speaks in the Brady Press Briefing at the White House in Washington, Friday, April 19, 2013, regarding the Boston Marathon bombing. (AP Photo/Charles Dharapak)
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