(NBC NEWS) An FBI informant who has helped catch some of the world’s most dangerous terrorists is coming out of witness protection to warn that a terrorist sheik in prison remains a significant threat to the U.S.

Emad Salem is urging the U.S. to keep the ailing 74-year-old sheik Omar Abdel Rahman, often known as the Blind Sheik, behind bars and to not transfer him, even as governments overseas continue to press for his release.

“He will kill Americans,” said Salem. “He will kill anyone who disputes what he says with a fatwa.”

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