A Navy official said a U.S. ship was forced to change course and move out of the way of fast boats from the Iranian Revolution Guard Corps, while moving through the Strait of Hormuz during the weekend, in what has become a frequent occurrence there. Three British Royal Navy ships were escorting the American ship, and all four vessels had to change direction.
Last Thursday, an American surveillance ship, the USNS Invincible, had a run-in with Iranian Naval frigate that USA officials characterized as "unprofessional".
The incident was "unsafe and unprofessional", the official told Reuters. The prefix "USNS" means the ship belongs to the U.S. Navy but is unarmed or only lightly armed. The Islamic Revolutionary Guard Corps could not immediately be reached for a comment. The gulf separates Oman from southeastern Iran.
Long-term tensions between Washington and Tehran were reduced when the US and several world powers agreed to end sanctions on Iran after an agreement to rein in the Islamic Republic's nuclear ambitions was signed. After tightening sanctions against Iran in response to a ballistic missile test, White House officials said the measures were an "initial" step.
Similar incidents between the U.S. and Iran has occurred earlier.
While still a presidential candidate in September, Donald Trump vowed that any Iranian vessels that harassed the U.S. Navy in the Gulf would be "shot out of the water".
Iran has previously threatened to close off the strait in the past over tensions with the USA, a move that would lead to turmoil in global oil markets.
The apparent "harassment" of the USS Invincible on two occasions, came amid Iranian state media reports that Tehran had tested its newly acquired S-300 missile air defence system that is created to intercept incoming missiles, The Washington Post reported.