(WNBC-TV) A threatening letter was mailed to President Obama that is similar to two letters containing poisonous ricin sent to Mayor Bloomberg and his anti-gun group, officials confirmed Thursday.

The letter, first reported by NBC 4 New York, is being tested for ricin. It was received Wednesday at an off-site facility, and did not reach the White House, according to the Secret Service.

“This letter has been turned over to the FBI Joint Terrorism Task Force for testing and investigation,” said Brian Leary, a Secret Service spokesman.

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