Iran releases four Iranian-U.S. dual nationals in prisoner swap
"In line with orders from the Supreme National Security Council and in the national interest, four Iranian dual national prisoners have been released in a prisoner swap," Abbas Jafari Dowlatabadi was quoted as saying by Iranian news agencies.
IRNA news agency's English language service quoted him as saying the freed prisoners were Iranian-Americans.
(Reporting by Sam Wilkin and William Maclean; Editing by Dominic Evans)