Lieutenant Pete Pagano, a spokesman for the US Navy's 5th Fleet overseeing the Mideast, said authorities there were "aware of reports of this incident," but declined to comment further.
The reported attack comes after the United States has alleged that in past months Iran attacked oil tankers near the Strait of Hormuz, at the mouth of the Persian Gulf, something denied by Tehran.
Today's incident could push tensions between Iran and the United States even higher, more than a year after President Donald Trump unilaterally withdrew America from the nuclear deal and imposed sanctions now crushing Iran's economy.
The mysterious attacks on oil tankers near the Strait of Hormuz, Iran shooting down a US military surveillance drone and other incidents across the wider Middle East followed Trump's decision.
The latest assault saw Saudi Arabia's vital oil industry come under a drone-and-cruise-missile attack, halving the kingdom's output.
The United States has blamed Iran for the attack, something denied by Tehran.
Yemen's Houthi rebels, whom the kingdom is fighting in a yearslong war, claimed that assault, though analysts say the missiles used in the attack wouldn't have the range to reach the sites from Yemen.
-AP