UN nuclear watchdog "increasingly concerned" about uninspected Isfahan enrichment plant in Iran

The UN nuclear watchdog, the International Atomic Energy Agency (IAEA), said on Friday it is "increasingly concerned" about an underground uranium-enrichment plant at Isfahan that Iran declared last year but has not let inspectors visit. The warning appears in a confidential quarterly report to member states.

"The Agency does not know the plant's exact location, its status for safeguards purposes or whether it contains nuclear material," the report says.

Iran has not let IAEA inspectors back into any of its nuclear facilities bombed by Israel and the United States in a 12-day campaign in June 2025. As a result the agency cannot verify Iran's enriched uranium stockpile. The report calls for Iran to provide information about its enrichment facilities and highly enriched uranium and allow inspectors to return. The agency says its lack of access and information is a serious proliferation concern.