Israel believes deeply buried stocks of enriched uranium at one Iranian nuclear facility hit by the U.S. military are potentially retrievable, a senior Israeli official said.And the agency that built the U.

The Israeli assessment also holds that Iran's stockpiles were spread across Isfahan, Fordo, and Natanz, and had not been moved.

Despite massive bombings, some near-weapons-grade uranium appears intact—fueling concerns of a new nuclear hide-and-seek era.