WASHINGTON/CAIRO — The U.S. and Iran found themselves back on a war footing on Wednesday after the most significant exchange of fire in weeks, with Washington threatening more devastating strikes while Iran protested an attack that it said killed five and wounded dozens of civilians at a wedding. The U.S. military's Central Command said it struck Islamic Revolutionary Guard Corps air defenses, radar systems, maritime assets, mine-laying capabilities and communications sites on Tuesday, with Iranian media reporting hits on multiple targets near the Strait of Hormuz — the narrow waterway where Tehran has threatened tankers attempting to pass without authorization. Iran said it struck U.S. assets in Jordan and Iraq, according to official statements, while Iranian media reports said it also attacked Bahrain. Although the IRGC said it killed a large number of U.S. forces in Jordan, two U.S. officials told Reuters there had not been any casualties, according to initial assessments. Jordan's armed forces said their air defense systems dealt with 13 ballistic missiles that entered the kingd