American intelligence agencies have determined that Iran or potentially another group could retrieve Iran’s primary store of highly enriched uranium even though it was entombed under the country’s nuclear site at Isfahan by U.S. strikes last year, according to multiple officials familiar with the classified reports. Officials familiar with the intelligence said that Iran can now get to the uranium through a very narrow access point. It is unclear how quickly Iran could move the uranium, which is in gas form and stored in canisters. U.S. officials have said that American spy agencies have constant surveillance of the Isfahan site...