The UN nuclear watchdog said on Friday it had made no progress in talks with Iran to finalize a deal on easing an investigation into suspected nuclear weapons research by Tehran and it called the outcome "disappointing".
Herman Nackaerts, global head of inspections for the International Atomic Energy Agency, said after Friday's meeting at IAEA headquarters in Vienna that no date for further talks on the matter had been set.
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The United States, European powers and Israel want to curb Iranian atomic activities they suspect are intended to produce nuclear bombs. Tehran says the aims of its nuclear program are purely civilian.
Six world powers were watching the IAEA-Iran meeting closely to judge whether Tehran was ready to make concessions before its broader talks with them later this month in Moscow on their decade-old nuclear dispute.
The IAEA had been pressing Iran for an agreement that would give its inspectors immediate access to the Parchin military complex, where it believes explosives tests relevant for the development of nuclear bombs have taken place.
Iran has said it would work with the UN agency to prove that such allegations are "forged and fabricated".
Both Iran and the IAEA said earlier that significant headway had been made on a so-called "structured approach" document that would set the overall terms for the IAEA's investigation.
But differences remained on how the IAEA should conduct its inquiry and the United States said this week it doubted whether Iran would give the UN agency the kind of access to sites, documents and officials it needs.