WASHINGTON, June 26 (Xinhua) -- U.S. President Donald Trump said on Friday that Iran violated the ceasefire agreement between the two sides by launching at least four one-way attack drones at commercial ships transiting the Strait of Hormuz.

"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.