The attack is said to be a response to "Iran's continued aggression against merchant ships", most recently a Panama-flagged ship in the Strait of Hormuz last night.
"Iran was given an opportunity to respect the ceasefire, but chose not to do so," Centcom writes on X.
The military is said to have targeted Iranian military surveillance infrastructure, communications systems and air defence facilities, among other things.
Iran's state-run radio and television company Irib reports explosions in Sirik and Qeshm.
The US strikes on Saturday are just the latest in a series of escalations between the countries. The situation intensified on Thursday, when a ship passing through the Strait of Hormuz was reportedly attacked by a drone originating from Iran.
The United States and Iran have signed a memorandum of understanding aimed at eventually ending the war between the countries permanently. A ceasefire is in place while negotiations continue.
