US officials have not confirmed the return of a former FBI agent that Washington claimed had gone missing in the Iranian island of Kish.

Iranian sources reported on Thursday that former FBI Agent, Robert Levinson, had returned to his country.

State Department spokesman Karl Duckworth said that the department was aware of unconfirmed accounts in the media that he had departed from Iran.

However, he stated that the US will continue to work with the Swiss Embassy in Iran to get information on Levinson's whereabouts.

FBI spokesman John Miller also revealed that the FBI is unable to confirm the reports.

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