Oil prices jumped on Monday to their highest since January as the United States' weekend move to join Israel in attacking Iran's nuclear facilities stoked supply concerns. Brent crude futures were up $1.

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.