DUBAI, Feb 3 (Reuters) - A group of Iranian gunboats approached a U.S.-flagged tanker in the Strait of Hormuz north of Oman, maritime sources and a security consultancy said on Tuesday.

The Iranian boats ordered the tanker, the Stena Imperative, to stop its engine and prepare to be boarded before it could speed up and continue its voyage, maritime risk management group Vanguard said.

The vessel did not enter Iranian internal........

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