INSIGHT-Iran, US on verge of prisoner swap under Qatar-mediated deal

When $6 billion of unfrozen Iranian funds are wired to banks in Qatar as early as next week, it will trigger a carefully choreographed sequence that will see as many as five detained U.S. dual nationals leave Iran and a similar number of Iranian prisoners held in the U.S. fly home, according to eight Iranian and other sources familiar with the negotiations who spoke to Reuters.