US Navy ship fired warning shots at an armed Iranian patrol boat - CNN

"A US Navy ship fired warning shots at an armed Iranian patrol boat Tuesday in the northern end of the Persian Gulf, according to two US defense officials," CNN reported recently.

Key quotes:

• The Iranian boat is believed to have been operated by the Iranian Revolutionary Guard Corps
• The Iranians did not respond to any warnings from the US ship, including radio calls, firing of flares and five short blasts from the US Navy ship's whistle, which is the internationally recognized communications signal for danger