Three Americans freed by Iran in a prisoner exchange are on their way back home. U.S. officials say a plane carrying Washington Post reporter Jason Rezaian, Saeed Abedini and Amir Hekmati left Tehran this morning. A fourth American, Nosratolla Khosravi-Roodsari, was not on the plane. It's not clear if he chose to stay in Iran or if he left separately.

Rezaian's wife was also on the plane that's expected to land in Switzerland. A deal reached between the U.S. and Iran after 14 months of secret negotiations led to the release of the Americans.

U.S. officials said American student Matthew Trevithick was also released in a move unrelated to the swap. In return, the U.S. is granting clemency to seven Iranians who had been convicted or awaiting trial for violating U.S. sanctions against Iran.