U.S. intelligence shows that Iran has been preparing for possible strikes on U.S. bases, officials say.

Iran has prepared missiles and other military equipment for strikes on U.S. bases in the Middle East should the United States join Israel’s war against the country, according to American officials who have reviewed intelligence reports.

The United States has sent about three dozen refueling aircraft to Europe that could be used to assist fighter jets protecting American bases or that would be used to extend the range of bombers involved in any possible strike on Iranian nuclear facilities.