Search and rescue efforts were underway Monday morning local time after the USS John S. McCain collided with a merchant ship, the US 7th Fleet said in a notice.
The ship, a guided-missile destroyer, was involved in the collision while on its way to Singapore for a routine port visit, the notice said. The incident happened east of Singapore and the Strait of Malacca, the 7th Fleet said.
The note also said initial reports indicated the destroyer sustained damage to its port side, and "the extent of damage and personnel injuries is being determined."
Still, the ship is currently sailing under its own power and heading to port, the 7th Fleet said.
US Sen. John McCain reacted to the incident on Twitter:
The merchant vessel involved in the collision is the Alnic MC, which is a Liberian-flagged, 183 meter-long oil or chemical tanker of 50,760 deadweight tonnes, according to shipping data in Thomson Reuters Eikon.
Shipping data showed it last sent a transponder signal at 2258 GMT Sunday and has since come to a halt 10 to 20 kilometers (6-12 miles) off the east coast of the Pengerang Peninsula in Johor, southern Malaysia.
The ship data showed it was "ballasting," meaning that it was not loaded full of oil for cargo.
The US Navy said last week it had removed the two senior officers and the senior enlisted sailor on a US warship that almost sank off the coast of Japan in June after it was struck by a Philippine container ship.
That collision killed seven US sailors aboard the guided-missile destroyer the USS Fitzgerald.