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The official, speaking on condition of anonymity, said the boats came within 600 yards (meters) of the USNS Invincible, a tracking ship, and stopped. The Invincible and three ships from the British Royal Navy accompanying it had to change course.
The official said attempts were made to communicate over radio, but there was no response and the interaction was "unsafe and unprofessional."
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| U.S. sailors in a rigid-hull inflatable boat approach the Military Sealift Command missile range instrumentation ship USNS Invincible (L) to conduct a personnel transfer in Arabian Sea on November 21, 2012. Courtesy Deven B. King/U.S. Navy/Handout via REUTERS |
The Islamic Revolutionary Guard Corps could not immediately be reached for a comment.
Years of mutual animosity eased when Washington lifted sanctions on Tehran last year after a deal to curb Iran's nuclear ambitions. But serious differences remain over Iran's ballistic missile program and conflicts in Syria and Iraq.
While still a presidential candidate in September, Donald Trump vowed that any Iranian vessels that harassed the U.S. Navy in the Gulf would be "shot out of the water."
Similar incidents happen occasionally, but the last serious one was in January when a U.S. Navy destroyer fired three warning shots at four Iranian fast-attack vessels near the Strait of Hormuz after they closed in at high speed and disregarded repeated requests to slow down.
"Well I don't know how much of a pattern it is, we actually had seen quite an improvement in Iran's behavior until recently," Pentagon spokesman Captain Jeff Davis told reporters.
Davis said that dangerous interactions were a matter of concern because they could lead to a "miscalculation or an accidental provocation."
