A Swiss plane carrying four American prisoners and some family members left Tehran on Sunday as part of a prisoner swap deal, a US official told Reuters.
"Yes, the plane has left," the official told Reuters.
The four are Jason Rezaian, the Washington Post's Tehran bureau chief, Saeed Abedini, a pastor from Idaho, Amir Hekmati, a former Marine from Flint, Michigan, and Nosratollah Khosravi-Roodsari.
A fifth prisoner, the American student Matthew Trevithick, was released separately from the other four on Saturday, a US official said.