A US Navy patrol boat fired a warning shot at an Iranian military ship Tuesday as it made an alarmingly fast and close approach in the Persian Gulf, marking the latest aggressive encounter between the two adversaries.

The unidentified Iranian Revolutionary Guard Corps vessel got within 200 yards of the USS Thunderbolt before the American patrol boat fired the warning shot, quickly ending the encounter. A Pentagon official described it as an isolated incident and said one person was hurt.

It was not clear where in the Persian Gulf the incident occurred or how many Americans were aboard the Thunderbolt. The vessel, based in Norfolk, can carry a crew of 27 and is used primarily to patrol coastlines and provide surveillance for interdiction operations.

US officials also have not disclosed what type of weapons the crew fired.

At least three other US vessels were nearby at the time.

Iranian military officials characterized the incident as a US provocation and took credit for having ‘‘neutralized’’ the threat.

In a report published last winter, the Office of Naval Intelligence indicated that vessels operated by the Revolutionary Guard Corps routinely monitor US and allied warships in the Persian Gulf and the Strait of Hormuz, a busy waterway that links to the Gulf of Oman.

The majority of the encounters are ‘‘safe and routine,’’ it said, but ‘‘unprofessional or aggressive’’ run-ins are becoming more frequent.

washington post