Letter addressed to President Obama contained ricin, initial tests show

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WASHINGTON (CNN) – A letter addressed to the White House preliminarily tested positive for the deadly poison ricin, the FBI said Wednesday.

That letter arrived at an off-site mail screening facility and was quarantined by the Secret Service, the FBI said.

Earlier Wednesday, the Secret Service said a letter addressed to President Barack Obama was intercepted Tuesday at the White House’s off-site mail facility.

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