The release of a US journalist and three other dual citizens by Iran shows the extent to which relations have improved between the former foes, a Middle East analyst has said.
Dr Sanam Vakil said the releases under a bilateral prisoner swap had been a "surprise addition" to a landmark nuclear deal that saw international sanctions on Iran lifted last night.
"Its a sign of the confidence building that has come out of the nuclear agreement," she said.
Neither Iran nor the United States have had diplomatic relations for well over three decades - there's a lot of tension and mistrust.
But its sign that this is an administration in Iran that is seeking to build bridges and in areas of mutual interest there can be cooperation.
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