A member of the FBI arrives on scene to investigate a suspicious letter that arrived at U.S. Sen. Carl Levin's Saginaw office in the Wickes Building, 515 N. Washington in Saginaw on Wednesday April 17, 2013. The incident comes a day after officials said a letter sent to Sen. Roger Wicker in Washington tested positive for poisonous ricin. (AP Photo/The Saginaw News,Jeff Schrier ) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

Associated Press
A member of the FBI arrives on scene to investigate a suspicious letter that arrived at U.S. Sen. Carl Levin's Saginaw office in the Wickes Building, 515 N. Washington in Saginaw on Wednesday April 17, 2013.  The incident comes a day after officials said a letter sent to Sen. Roger Wicker in Washington tested positive for poisonous ricin.  (AP Photo/The Saginaw News,Jeff Schrier ) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT
A member of the FBI arrives on scene to investigate a suspicious letter that arrived at U.S. Sen. Carl Levin's Saginaw office in the Wickes Building, 515 N. Washington in Saginaw on Wednesday April 17, 2013. The incident comes a day after officials said a letter sent to Sen. Roger Wicker in Washington tested positive for poisonous ricin. (AP Photo/The Saginaw News,Jeff Schrier ) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT
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