The International Atomic Energy Agency's (IAEA) board of governors held a meeting in Vienna on Thursday, calling on Iran to explain the source of uranium traces found at an undisclosed location and said it would hold a meeting with the Iranians to assess compliance with the nuclear deal.
In light of UN resolution 2231 of 2015, the IAEA Board of Governors convened and discussed steps to monitor Iran's nuclear program and discussed verification and monitoring of North Korea and Syria.
After the meeting, IAEA Acting Director-General Cornell Verotta said: "We have discovered material that has not been reported by Iran, and we asked for additional information in this regard.
Verota said at the quarterly meeting of the IAEA's 35-nation board of governors that he would not try to classify the seized uranium particles and that he had so far not expected anything in that regard, but was counting on the interaction of the Iranians and waiting for them to clarify.
He said Iran's heavy water reserves had now exceeded 130 tonnes, adding that Iran had installed some of the most advanced centrifuges in the Natanz reactor, not only for research and development, but also for enriching uranium. He also revealed that Iran had resumed uranium enrichment at the Fordow facility.
Reuters reported in September that the IAEA had found uranium traces at the site, which Israeli Prime Minister Benjamin Netanyahu drew last year as a "secret atomic storage", but Iran said the site was a carpet-cleaning facility.
Verota said the IAEA had maintained contacts with Iran since then and had not received additional information yet, although he told Tehran at the time that "time was of the essence" and that the explanations it provided were incoherent.