The visit took place last November. The sources said Santiago told agents that US intelligence had infiltrated his mind and were forcing him to watch ISIS propaganda videos.

"In November 2016, Esteban Santiago walked into the Anchorage FBI Field Office to report that his mind was being controlled by a U.S. intelligence agency," a senior federal law enforcement official said.

"During the interview, Santiago appeared agitated and incoherent, and made disjointed statements.  Although Santiago stated that he did not wish to harm anyone, as a result of his erratic behavior, interviewing agents contacted local authorities who took custody of Santiago and transported him to a local medical facility for evaluation.