According to the Pentagon, a US Coast Guard ship fired warning shots at Iranian boats that approached American naval vessels in the Strait of Hormuz.
On Monday, 13 fast boats from Iran's Islamic Revolutionary Guard Corps Navy (IRGCN) approached US vessels within 140 meters (459 feet), according to the Pentagon.
According to the Pentagon, the Iranian vessels left after 30 warning shots were fired.
This is the region's second such incident in two weeks.
The Iranian warships, according to Pentagon spokesman John Kirby, were "behaving very aggressively" close the US military vessels, which were escorting the guided-missile submarine USS Georgia.
"It's risky and unprofessional. It's the type of operation that can result in someone getting injured, as well as a major blunder in the area "he said "That isn't in anyone's best interests."
