(NBC News) Iran’s Revolutionary Guard released video Saturday that shows masked commandos rappelling onto a seized British oil tanker in the Strait of Hormuz, according to Iranian state TV.

The oil tanker was seized by Iranian forces Friday while another was temporarily stopped and sent on its way, according to a U.S. official and the tankers’ operators.

Iran’s Revolutionary Guard claimed in a statement that it seized a British oil tanker named Stena Impero for “violating international regulations.”

“After it was seized it was transferred to Iranian shores to undergo legal procedure,” the IRG said in a statement.

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