The four Americans who were part of a prisoner exchange between the U.S. and Iran have been released by Iran, a senior administration official confirms, and those who wished to depart the country have left.
A fifth American was released separately from the exchange.
The release of the prisoners was the result of "tireless" work by American diplomats, on the sidelines of nuclear negotiations with Iran, President Obama said Sunday.
"I've met with some of the families. I've seen their anguish — how they ached for their husbands and sons," Obama said.