The International Atomic Energy Agency (IAEA) expressed serious concern about Iran’s gas enrichment plant in Isfahan, announced in June 2025 but never tested.
According to a confidential report, the agency cannot determine the facility's exact location, operational status or whether it contains nuclear material. According to estimates, the factory is located inside a network of underground tunnels that was targeted during US-Israeli attacks.
The Director General of the IAEA, Raphael Grossi, previously warned that significant amounts of 440.9 kg of Iran's uranium enriched to 60% purity, approaching weapons-grade levels, could be stored in Isfaya.
Iran continues to deny inspectors access to its bombed nuclear facilities, leaving the condition and location of its enriched uranium stockpile unverified. Tehran claims that the tests cannot be resumed due to US military threats, while the IAEA warns that the lack of transparency is a "serious proliferation concern" that requires an urgent solution.