Officials arrest suspect in ricin mailings

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Federal officials have arrested a Mississippi man for suspicious packages sent to U.S. leaders, including President Barack Obama.

The suspect has been identified as Kenneth Curtis.

Tuesday, a package sent to Sen. Roger Wicker, R-Mississippi, tested positive for ricin. A second package addressed to the president also contained a “suspicious substance.”

Wednesday, Senate offices were cleared over concerns about a suspicious envelope and a man with a backpack.

Ricin is a powerful poison that stops cells from producing the proteins they need to survive. This leads to system failures and can even prove deadly.