The above-ground pilot enrichment plant at Iran's Natanz nuclear site has been destroyed, U.N. nuclear watchdog chief Rafael Grossi told a meeting of the U.N. Security Council on Friday on Israel's strikes on Iran.

Israeli defense officials believe damage to major facility is significant, while other enrichment facility at Fordo, nuclear sites in Isfahan, Busheir reportedly not targeted

However, the IDF has so far not attacked from the air against the Fordow nuclear facility, which lies underneath a mountain.