A U.S. Navy coastal patrol ship changed course after a fast-attack craft from Iran’s Islamic Revolutionary Guard Corps came within 100 yards (91 meters) of it in the central Gulf on Sunday, U.S. Defense Department officials said on Tuesday.
It was at least the fourth such incident in less than a month. U.S. officials are concerned that these actions by Iran could lead to mistakes.
Years of mutual animosity eased when Washington lifted sanctions on Tehran in January after a deal to curb Iran’s nuclear ambitions. But serious differences still remain over Iran’s ballistic missile program, and over conflicts in Syria and Iraq.
Pentagon spokesman Captain Jeff Davis said the Iranian vessel sailed directly in front of the USS Firebolt, forcing the 174-foot (53-metre) U.S. ship to change course.
The incident began when seven Iranian ships “harassed” the Firebolt, Davis said.
A U.S. Defense official, speaking on the condition of anonymity, said the interaction was “unsafe and unprofessional due to lack of communications and the close-range harassing maneuvering,” adding that uncovered and manned weapons were seen on the Iranian vessel.