Jason Rezaian, the Washington Post's Tehran correspondent, is pictured at The Washington Post in Washington, DC in this November 6, 2013 handout photo. [Photo/Agencies]

TEHRAN -- Iran released the detained Iranian-American Washington Post reporter Jason Rezaian on Saturday as part of prisoner swap, Iran's state IRINN TV reported.

Earlier on Saturday, Iran's prosecutor general announced that the country had released four Iranian prisoners with dual nationals.

"In line with the order of Iran's Supreme National Security Council and the interests of the country, Iran has released four Iranian dual-national prisoners as a part of prisoners swap," the announcement said.

An informed source told IRINN on Saturday that the names of the released inmates are the Iranian-Americans: Saeed Abedini, Amir Mirzaee Hekmati, Nosratollah Khosravi and Jason Rezaian.

Based on the prisoner swap deal, seven Iranians in the prisons of the United Sates will also be released, the source was quoted as saying.

A number of Iranian-Americans were detained in the past years in the country on espionage charges and propagating against the Islamic establishment.

The announcement came as Iran and the world powers are expected to announce the "implementation" of July historic deal on the former's disputed nuclear program on Saturday which will significantly scale back the country's atomic plan in exchange for the international and Western sanction relief on Iran's energy and financial sectors.