CNN:

A US Navy patrol craft fired three warning shots at an Iranian Revolutionary Guard Corps boat Wednesday after US officials said it had harassed that patrol craft, CNN has learned.

Another US patrol craft and a Kuwaiti Navy ship were also harassed in the incident, which took place in the northern end of the Persian Gulf.
In an encounter Tuesday, a US Navy official told CNN four Iranian Revolutionary Guard Corps vessels conducted a "high-speed intercept" of the USS Nitze in waters near the Strait of Hormuz Tuesday, deeming the incident "unsafe and unprofessional."
The official said two of the vessels slowed and turned away only after coming within 300 yards of the US guided-missile destroyer as it transited international waters near the Strait of Hormuz, and only after the destroyer had sent multiple visual and audio warnings.

 

Go to link