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Iran tells UN nuclear agency that monitoring cannot proceed while it is under threat
The watchdog said it cannot verify the plant’s location or uranium stockpile, and urged Tehran to restore access for inspectors.
On Friday, the International Atomic Energy Agency reported it is "increasingly concerned" about an underground uranium-enrichment plant at Isfahan that Iran declared last year but has blocked inspectors from entering.
Inspectors have been unable to return to nuclear facilities since a 12-day bombing campaign by Israel and the United States in June 2025 destroyed or damaged other uranium enrichment plants.
"The Agency does not know IFEP's exact location, status for safeguards purposes or whether it contains nuclear material," the IAEA reported, noting Iran has refused to provide design plans.
The IAEA warned that the lack of access and information presents a "serious proliferation concern" requiring rectification with "the utmost urgency."
IAEA chief Rafael Grossi stated in March that his agency believed a significant amount of Iran's most highly enriched uranium was stored within the tunnel complex at Isfahan.