The USS Mahan established radio communication with the Islamic Revolutionary Guard Corps boats but they did not respond to requests to slow down.

A US Navy destroyer fired three warning shots at four Iranian fast-attack vessels after they closed in at a high rate of speed near the Strait of Hormuz, two US defense officials told Reuters on Monday.

The incident, which occurred Sunday and was first reported by Reuters, comes as US President-elect Donald Trump prepares to take office on Jan. 20. In September, Trump vowed that any Iranian vessels that harass the US Navy in the Gulf would be “shot out of the water.”

The officials, speaking on the condition of anonymity, said the USS Mahan established radio communication with the Islamic Revolutionary Guard Corps boats but they did not respond to requests to slow down and continued asking the Mahan questions.

The Navy destroyer fired warning flares and a US Navy helicopter also dropped a smoke float before the warning shots were fired.

The Iranian vessels came within 900 yards (800 meters) of the Mahan, which was escorting two other US military ships, they said.

The IRGC and Trump transition team were not immediately available for comment.

Years of mutual animosity eased when Washington lifted sanctions on Tehran last year after a deal to curb Iran’s nuclear ambitions. But serious differences still remain over Iran’s ballistic missile program as well as conflicts in Syria and Iraq.

One official said similar incidents occur occasionally.

Most recently in August, another US Navy ship fired warning shots towards an Iranian fast-attack craft that approached two US ships.

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