Natanz Nuclear Facility in Iran. Photo: Hamed Saber.

Reuters – Iran and six world powers are making little progress in arduous talks on ending their dispute over Tehran’s nuclear program, a senior U.S. official said on Friday, fanning doubt about the prospects for a breakthrough by a self-imposed July deadline.

The Islamic Republic also said the latest round of negotiations, which began in Vienna on Wednesday and were expected to end later on Friday, were difficult and slow.

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