There is a chance that much of Iran's highly enriched uranium survived Israeli and U.S. attacks because it may have been moved by Tehran soon after the first strikes, U.N. nuclear watchdog chief Rafael Grossi said on Wednesday.

Defense Secretary Pete Hegseth said he didn't know of any intelligence showing that stores of highly enriched uranium were moved out of the Iranian nuclear sites hit by American bombers over the weekend.

U.S. Defense Secretary Pete Hegseth on Thursday said he was unaware of any intelligence suggesting Iran had moved any of its highly enriched uranium to shield it from U.S. strikes on Iran's nuclear program over the weekend.