The International Atomic Energy Agency said that an analysis of satellite imagery collected after the Israeli attacks found evidence of a "direct impact" on the underground part of the uranium enrichment plant in Natanz.
At the same time, IAEA experts found no similar damage at other sites - in Isfahan and Fordow.
On Friday, IAEA chief Rafael Grossi told the UN Security Council that "the above-ground part of the enrichment facility, where Iran produced uranium enriched to 60%, was destroyed".
He added that "there is no evidence of a physical impact on the underground cascade hall, which houses part of the experimental enrichment facility and the main enrichment facility".