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The FBI warned the Rev. Al Sharpton that an inmate at an upstate New York prison was talking about sending a “dangerous substance” in the mail to his New York City offices.

An official said the inmate might have sent as many as 12 threatening letters, some containing a powder believed to be harmless.

“A couple of the letters have already arrived and tested negative,” the official said speaking on condition of anonymity.

“For his safety, we have been advised that he or his staff should not open any packages or letters from a specific addressee or any mail that looks suspicious,” said lawyer Sanford Rubenstein, an associate of Sharpton.

Sharpton also sent word to National Action Network offices around the nation “of this potential danger,” Rubenstein said.

The FBI has confirmed the reported threat.