May 28 (UPI) -- The U.S. military attacked Iran, Tehran confirmed early Thursday, as Iran announced retaliatory strikes of its own. Iran targeted a U.S. air base at about 4:50 a.m. local time in response to the U.S. military striking presumed Iranian military assets near Bandar Abbas Airport in southern Iran. "This response is a serious warning so that the enemy knows aggression will not go unanswered, and that in the event of a repeat, our response will be more decisive and the responsibility