"One of the Drones solidly hit the upper deck of a large and very expensive cargo-carrying ship," Trump wrote in a post on Truth Social.

"Damage was done, but the ship was able to proceed on its way," he said. "We knocked down three other drones."

Trump said the drone attack "obviously" violated the newly signed U.S.-Iran ceasefire agreement.

He did not name the ship or specify when the strike occurred. However, the British military said Thursday that a vessel had been hit by a projectile off the coast of Oman.

The International Maritime Organization, a UN agency, said Thursday in a statement that it had suspended efforts to evacuate ships stranded in the crucial global energy waterway in the wake of the drone attack.

On June 18, Iran and the United States signed the MoU to end the war in the region on all fronts, including Lebanon.

Under the MoU, the two countries agreed to 60 days of negotiations, which are already underway, toward a final agreement mainly on Iran’s nuclear program and the removal of sanctions against the country.