The U.S. military struck three sites in Iran early Sunday, inserting itself into Israel’s effort to destroy Iran's nuclear program in a risky gambit to weaken a longtime foe. The decision to directly involve the U.

Last week, Israel struck four buildings at the Isfahan nuclear site, among them a uranium conversion facility. The IAEA said there has been no sign of increased radiation at Isfahan, which is roughly 350 kilometers (215 miles) southeast of Tehran.