American sources tell the AP and other U.S. media that the attacks are ongoing.
The U.S. attacks occurred just hours after U.S. President Donald Trump accused Iran of violating the ceasefire.
"Iran's dangerous behavior undermines freedom of navigation as trade increasingly travels through the vital strait," Centcom wrote in a post on X.
According to Trump, the upper deck of a cargo ship was hit by a drone on Thursday - fired by Iran.
"Damage occurred, but the ship was able to continue its journey. We shot down three other drones. This is clearly a stupid violation of our ceasefire agreement," Trump writes on Truth Social.
Trump did not specify which incident he was referring to. But it is known that a ship was hit by a projectile in the Gulf of Oman on Thursday. The Iranian Revolutionary Guard has warned ships against sailing through the Strait of Hormuz without permission.
The United States and Iran have signed a memorandum of understanding aimed at permanently ending the war between the countries. A ceasefire is in place while negotiations continue.
