Already a subscriber? Make sure to log into your account before viewing this content. You can access your account by hitting the “login” button on the top right corner. Still unable to see the content after signing in? Make sure your card on file is up-to-date.

The United Nations nuclear watchdog agency has called on the Iranian government to let inspectors back into its nuclear sites immediately.

Getting into it: In a confidential report sent to member states Friday, the International Atomic Energy Agency said it is “increasingly concerned” about the Isfahan Fuel Enrichment Plant, an underground uranium enrichment site it has never been allowed to inspect, saying it doesn’t know where the plant is, what its status is or whether it holds nuclear material.

Iran told the agency about the plant on June 12, 2025, and inspectors were set to visit the next day, but the visit was canceled when Israel launched strikes on Iran’s nuclear sites that morning. Diplomats believe the plant is inside a tunnel complex at Isfahan, where the IAEA thinks Iran kept a large share of its highly enriched uranium. None of the sites the US and Israel bombed have been reopened to inspectors, and Bushehr, Iran’s nuclear power plant, is the only place the IAEA has been able to visit since last June.

The agency estimates Iran has about 972 pounds of uranium enriched to 60%, not far from the 90% needed for a weapon and enough for as many as 10 bombs if Iran chose to build them, but it hasn’t been able to verify the stockpile since the June 2025 strikes. Earlier this month, Iran said it won’t discuss letting inspectors back in while Trump keeps threatening new attacks on its nuclear facilities, and objected to Washington putting up as much as $20 million in reward money for tips about its nuclear work.

The IAEA urged Iran to take “technical and gradual measures” so inspectors can get back in. Iran said it remains committed to resuming full cooperation once conditions allow, but that the issue won’t be resolved “until the root causes of the present situation are addressed.”

More to come.