A U.S. official said that six American warplanes dropped a dozen 30,000-pound bunker-busters on the Fordo nuclear site, and that Navy submarines fired 30 cruise missiles at the Natanz and Isfahan sites. One B-2 bomber also dropped two bunker-busters on Natanz, the official said.

Iran and Israel traded air and missile strikes as the world braced on Monday for Tehran's response to the U.S. attack on its nuclear sites and U.S. President Donald Trump raised the idea of regime change in the Islamic republic.