This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP
This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP

US Navy patrol ship fires warning shots at Iranian vessel in the Gulf

This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP
This video grab still image obtained July 25, 2017, courtesy of the US Navy, shows an IRGCN boat heading towards the USS Thunderbolt in the Gulf. A US Navy patrol ship fired warning shots at an Iranian Revolutionary Guard Corps vessel in the Persian Gulf on July 25, 2017 after it approached within 150 yards (137 meters), a US defence official said.Photo: US Navy handout via AFP
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