Oh, Nice - We Need More Military Action at This Time

A US patrol ship fired several warning shots from a heavy machine gun at an Iranian craft that approached within 150 yards and ignored other warnings, Pentagon officials told reporters on Tuesday.

USS Thunderbolt opened fire only after it tried to warn off the Iranians over the radio, by firing flares, and blowing five short blasts from its whistle, the officials said. The warning shots were fired into the water, out of concerns of a possible collision.

[...]

The Iranian ship had approached to within 150 yards (137 meters), but “ceased its provocative actions” after the warning shots, US officials added. The vessel stayed in the area, which was described as being in “international waters in the northern Arabian Gulf,” the Pentagon’s preferred term for the Persian Gulf.

  RT

And what do the Iranians say?

Later on Tuesday, the IRGC [Islamic Revolutionary Guard Corps] issued a statement confirming that an incident took place, but said that a US Navy ship moved towards an Iranian vessel of the 3rd Naval Division and fired two rounds in an attempt to intimidate. The IRGC condemned the “unprofessional and provocative behavior” of the US crew.

...but hey, do what you want...you will anyway.