U.S. ricin attack

Associated Press
A City of Corinth police car prevents access to a house in the West Hills Subdivision in Corinth, Miss. on Thursday morning, April 18, 2013. Law enforcement officials were blocking off the dwelling after taking Paul Kevin Curtis of Corinth, Mississippi into custody Wednesday under the suspicion of sending letters covered in ricin to U.S. President Barack Obama and Mississippi Sen. Roger Wicker (R-MS). Curtis was arrested at his home in Corinth, Mississippi, and is "believed to be responsible for the mailings of the three letters sent through the U.S. Postal Inspection Service which contained a granular substance that preliminarily tested positive for ricin," the Justice Department said in a statement. (AP Photo/Rogelio V. Solis)

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Paul Kevin Curtis, the suspect arrested  for sending potentially poison-laced letters intended for President Barack Obama and Republican Sen. Roger Wicker of Mississippi, was released from jail April 22.

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