Meanwhile, nearly 400 kilograms, or 880 pounds, of uranium enriched to 60% purity is still publicly unaccounted for.

Satellite images analyzed by The New York Times show the extent of damage at the three nuclear facilities hit by the United States. Fordo is Iran’s most critical nuclear enrichment facility, housed deep inside a mountain to shield it from attacks.

President Donald Trump said the strikes, which he described as “very successful,” had hit the Natanz, Fordo and Isfahan sites, with Fordo being the primary target. Iran’s state-run IRNA news agency confirmed there were attacks early Sunday at all three nuclear sites.