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Iran has freed five American prisoners, including Washington Post reporter Jason Rezaian.

Their release, first announced by Iranian media, was confirmed by American officials, CNN reports. Four of the Americans, including Rezaian, were freed as part of a prisoner swap, while a fifth, student Matthew Trevithick, was released as part of a separate agreement. It appears negotiations for the swap began in earnest after the finalization of the nuclear deal that limited Iran’s ability to develop a nuclear weapon.

Rezaian, the Post’s former bureau chief in Tehran, has been held since 2014, on charges of espionage.