Ten US Navy sailors are missing and five have been injured after a US destroyer and an oil tanker collided near Singapore, the Navy says.
The guided missile destroyer USS John S McCain was sailing east of Singapore and preparing to stop in the port when the collision with the Liberian-flagged vessel occurred.
It was reported before dawn at 05:24 local time on Monday (21:24 GMT on Sunday) and took place east of the Strait of Singapore, as the USS John S McCain prepared to perform a routine port stop in Singapore.
Singapore and US authorities said the destroyer sustained damage to her port side, which is the left-hand side of the vessel facing forward.
The tanker it collided with, Alnic MC, sustained damage to a tank near the front of the ship 7m (23ft) above the waterline, but none of its crew were injured and there were no oil spills.
At 182m (600ft), the tanker is slightly longer than the 154m-long US destroyer.
It is the second collision involving a US Navy ship in recent months.
A wide-ranging search and rescue operation is under way.
US military helicopters as well as the Singaporean and Malaysian navies and coast guards are currently conducting search and rescue operations.