(CNN)Iran has freed four prisoners from the United States, including Washington Post journalist Jason Rezaian, Iran’s semi-official FARS news agency reported Saturday, quoting Tehran’s prosecutor.

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The release is part of a prisoner swap deal, FARS reported.

The news agency did not name the other prisoners being released, or provide any details on the deal.

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Iran has been known to be holding Rezaian, Marine veteran Amir Hekmati and Christian pastor Saeed Abedini. Additionally, former FBI agent and CIA contractor Robert Levison has been missing since visiting Iran in 2007.

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