Formerly Detained Americans Return Home

Formerly Detained Americans Return Home
2:14 | 01/19/16

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Transcript for Formerly Detained Americans Return Home
this evening, one American is home, several others on the way after being held prisoner in Iran. Among them, a journalist, a pastor, a former marine. This image of the men as they make their journey back. Tonight, Skyping with family back home here in the united States, and our team, right there at that U.S. Base in Germany. It's still unclear when they'll board that plane home. ABC's chief white house correspondent Jonathan Karl tonight on how this all happened, and in a moment, the American who was not included. Reporter: Free at last. "Washington post" reporter Jason rezaian reunited with his family at a U.S. Military base in Germany, after spending 544 days in prison. Here, alongside his wife and brother, Ali, who spoke to ABC's Alex Marquardt. He's definitely lost some weight. But you know, he was joking, we we joking around. We were having a good time. You know, and really did act the same. Reporter: Former marine amir hekmati reunited with his family and congressman after enduring more than four years in prison. And pastor Saeed abedini's family celebrating his freedom after three and a half years. I told my kids, I will woke them up and I said, daddy's released from prison, you're going see him soon. Reporter: Student Matthew trevithick, greeted by his mother in Boston, is the first back to the U.S. All this after a dramatic 24 hours. Noon Saturday, the U.S. Confirms the prisoner exchange. Four hours later, the Iran nuclear deal goes into effect, sanctions lifted. But the plane doesn't leave. Iran won't let Jason rezaian's wife join him. Sunday morning, Iran finally agrees to allow rezaian's wife to get on the plane. While the plane is still in the air, the U.S. Government announces it is paying $1.7 billion to the Iranian government to settle an old financial dispute. And Jonathan Karl live with us from the white house. As you know, so many questions about the seven Iranians who were part of this prisoner swap. Four pardoned, three, their sentences commuted. People want to know, obviously, were their dangerous, do they pose a risk in being returned to Iran? Reporter: David, the white house says that none of those seven freed Iranians had any ties to terrorism, but four of them were convicted on charges related to smuggling military equipment to Iran, so, these were not trivial charges, David. Jon Karl, thank you. A mentioned a moment ago,

This transcript has been automatically generated and may not be 100% accurate.

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