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The Boston Globe

Nation

Letter with poison sent to Miss. senator

WASHINGTON — An envelope addressed to Senator Roger Wicker of Mississippi tested positive Tuesday for ricin, a potentially fatal poison, congressional officials said, heightening concerns about terrorism a day after a bombing killed three and injured more than 170 at the Boston Marathon.

One senator, Claire McCaskill of Missouri, said authorities have a suspect in the fast-moving case, but she did not say if an arrest had been made. She added the letter was from an individual who frequently writes lawmakers.

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