US drops bunker-buster bombs on Natanz underground enrichment facility in deepest strike yet on Iran's nuclear program

The United States conducted strikes on the underground Natanz Fuel Enrichment Plant on March 21, 2026 using large-diameter bunker-buster munitions capable of penetrating reinforced underground structures — a capability Israel lacked and that had been central to US-Israeli war planning. Iran confirmed the strikes, with the Atomic Energy Organization of Iran stating its facilities had been attacked. The IAEA stated it was assessing the impact and had received no indication of radiological release, though the attacks were assessed to have caused significant damage to underground centrifuge halls.