The ​UN ​nuclear ⁠watchdog says it is becoming “increasingly ⁠concerned” about ​an underground uranium enrichment plant ⁠at Isfahan that Iran declared last year ⁠but has ​not ⁠allowed any inspections. “The agency does not know IFEP's [Isfahan Fuel Enrichment Plant] exact location, status for safeguards purposes or ​whether ‌it ⁠contains nuclear ​material,” the International ​Atomic ‌Energy Agency ⁠said in a confidential report.