White House spokesman Jay Carney responds to a question about the Boston Marathon bombing at the White House in Washington
REFILE - ADDITIONAL CAPTION INFORMATION White House spokesman Jay Carney responds to a question about the Boston Marathon bombing, during a news conference in which he also addressed the media about investigations of a suspicious letter containing ricin that was addressed to U.S. President Barack Obama, at the White House in Washington April 17, 2013. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS CRIME LAW DISASTER)
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