The 39-year-old Jason Rezaian, a dual US-Iranian citizen born in California, was detained in Iran on July 22, 2014. (File Photo)
A senior Iranian official said four Americans freed under a prisoner swap deal were still in Iran and denied earlier reports suggesting they had already left the country.
"None of the four Americans, including (Washington Post reporter) Jason Rezaian have left Iran yet and when it happens it will be announced officially," said the official, who asked not to be named.
Iran's Tasnim news agency reported earlier that Rezaian and his wife Yeganeh Salehi had left Iran.
Iran released five Americans on Saturday as part of a prisoner swap with the United States, to reduce decades-old hostility as international sanctions were lifted on the Islamic Republic.
American prisoner Matthew Trevithick, who was released separately from the other four, has left Iran.
Iran emerged from years of economic isolation on Saturday when world powers lifted crippling sanctions after confirming that Tehran had curbed its nuclear programme as part of a deal agreed last year.
© Thomson Reuters 2016