A letter to President Obama that was intercepted at an off-site facility has tested positive for ricin, the FBI says.
The envelope, addressed to the White House, was immediately quarantined by U.S. Secret Service personnel and a coordinated investigation with the FBI was initiated.
The FBI said White House operations were not affected.
The letter was intercepted Tuesday, the same day that a letter to U.S. Sen. Roger Wicker was intercepted at an off-site facility and tested positive for ricin.
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