Iran's Revolutionary Guard Corps Navy intercepted six vessels in the Strait of Hormuz on Monday after they attempted to navigate unauthorized routes, according to state television reports citing Agence France-Presse.
Iranian naval forces fired warning shots to force the ships to abort their journey, marking another escalation along the strategic maritime trade corridor following recent hostilities with Washington that renewed on July 7.
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State television earlier reported an incident involving a single vessel before updating the details.
"Last night, six ships trying to pass on a route different from the designated one were stopped by the Revolutionary Guard navy using warning shots and forced to turn back," reported a Gulf correspondent for Iranian state television.
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This latest intervention follows a similar action on Saturday, when the Revolutionary Guard announced stopping four ships in the southern part of the strait using warning shots.
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Iranian armed forces have repeatedly blocked vessels in the key hydrocarbon transit route since resuming tension with the United States, claiming authority to collect passage tolls and restricting ships to coastal routes.