Updated on: May 28, 2026 / 10:49 PM EDT / CBS News Add CBS News on Google The U.S. military carried out another round of strikes on Iran, a U.S. official confirmed to CBS News on Wednesday, another challenge to a shaky ceasefire between the two countries . The official described the strikes as defensive, shooting down four Iranian drones and hitting a ground control station in the port city of Bandar Abbas that was about to launch a fifth. The drones posed a threat near the Strait of Hormuz, a crucial oil shipping chokepoint that has been closed since the war began.  The official said the U.S.-Iran ceasefire is still considered to be holding. "These actions were measured, purely defensive, and intended to maintain the ceasefire," the official added. Reuters was first to report on the new strikes. The Iranian government called the strikes a violation of the ceasefire and announced that it launched retaliatory fire on an American base in the region. Iran did not specify which U.S.…