Herman Nackaerts of the U.N.'s nuclear agency says the talks were "very constructive." Iranian envoy Reza Najafi speaks of a "constructive discussion." Both say the talks will resume Oct. 28, with Nackaerts saying they will be "substantive."
The two spoke Friday at the end of talks aimed at ending a nearly two-year stalemate. The U.N. agency wants access to a site it suspects was used to test conventional explosive triggers meant to set off a nuclear blast.
Iran denies working on, or interest in, nuclear arms.
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