The aircraft carrier USS Theodore Roosevelt and escort ships have deployed to waters off of Yemen "in response to the deteriorating security situation in Yemen," Pentagon spokesman Colonel Steven Warren told reporters.
Warren said the American warships are closely monitoring a convoy of nine Iranian cargo ships in the area but would not say whether the US naval forces might try to intercept the convoy if it approached a Yemeni port.
"We don't know what the Iranian convoy of ships plans to do, but we are watching them," Warren said. "By having American sea power in the region, we preserve our options."
But he said some media reporting on the situation, which suggested the Americans were preparing to prevent the Iranian convoy from reaching Yemen if there were weapons on board the ships, was "a bit over-cranked."
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The presence of the Iranian convoy "is one of the factors" in the US naval deployment but not the only one, he added.
A total of 12 US ships were in the region stretching from the Red Sea to the Gulf of Aden and the Arabian Sea, including nine combat vessels, navy officers said.
"They are operating in the Arabian Sea and the Gulf of Aden with the very clear mission to ensure that shipping lanes remain open, to ensure there's freedom of navigation through those critical waterways and to ensure there's maritime security," Warren said.