Officials are saying that A U.S. Navy destroyer, the USS Mahan, fired several warning shots at four Iranian fast-attack vessels after they closed in at a high rate of speed near the Strait of Hormuz.

From Yahoo:

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

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

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

The official added that the warning shots fired on Sunday were just one of seven interactions the Mahan had with Iranian vessels over the weekend, but the others were judged to be safe.