By Parisa Hafezi, Phil Stewart and Maayan LubellISTANBUL/WASHINGTON/JERUSALEM (Reuters) -Iran and Israel traded air and missile strikes as the world braced on Monday for Tehran's response to the U.S.

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.