FBI: Mississippi man arrested, accused in ricin letters

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Senate Ricin
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Senate Ricin
People leave the Dirksen Senate Office Building on Capitol Hill in Washington, Tuesday, April 16, 2013. An envelope addressed to Sen. Roger Wicker, R-Miss., tested positive Tuesday for ricin, a potentially fatal poison, congressional officials said, heightening concerns about terrorism a day after a bombing killed three and left more than 170 injured at the Boston Marathon. Wicker's office is in Dirksen. (AP Photo/Molly Riley)