(FOXNEWS) — Five Iranian Islamic Revolutionary Guard Corps gunboats tried to seize a British oil tanker in the Persian Gulf Wednesday but backed off after a British warship approached, a senior U.S. defense official told Fox News.

The British warship was said to have been less than 5 miles behind the tanker but soon intercepted the Iranian boats and threatened to open fire. A manned U.S. reconnaissance aircraft was above as well, the official said, adding that Iranian forces left without opening fire.

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