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Rezaian was reportedly facing up to 20 years, but the sentence was not specified on Monday.

He has already been behind bars for more than a year. Rezaian was taken into custody in July 2014 and later charged with espionage.

The Post has denied all the claims against him.

On Monday, the newspaper's executive editor Marty Baron said the "guilty verdict" announcement "represents an outrageous injustice."

"We are working with Jason's family and Iranian counsel to pursue an immediate appeal, and we expect Jason's lawyer, Leila Ahsan, also to petition for Jason to be released on bail pending a final resolution of the case," Baron said.

Iran's detention of Rezaian has been widely condemned. Analysts say he has been treated like a pawn amid internal political battles and geopolitical disputes between Iran, the United States and other world powers.