(CNN) — An arrest has been made in connection with possibly contaminated letters sent to President Obama and Sen. Roger Wicker, the Department of Justice said Wednesday.

Paul Kevin Curtis was arrested by the FBI at his home in Corinth, Mississippi, the department said in a statement.

Discovered Tuesday, the letters were addressed to Wicker, a Mississippi Republican, and to Obama. The justice department release said a third letter was sent to a Mississippi justice official.

The letters to Wicker and Obama were stopped at a government mail-screening facility after initial tests indicated the presence of the deadly poison ricin.

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