BBC:-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.
A wide-ranging search and rescue operation is under way.
It is the second collision involving a US Navy ship in recent months.
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.
US military helicopters as well as the Singaporean and Malaysian navies and coast guards are currently conducting search and rescue operations.
Malaysian Navy chief Admiral Kamarulzaman said a message had been sent to fishing vessels along the Johor and Pahang coasts to keep a look out for missing sailors.
A Malaysian Navy spokesman later told a news conference: “The waves are between 0.5m and 1.5m, so the sea is quite rough and can be very challenging if you don’t have a life jacket.”
The US Navy said four of the injured sailors had non-life threatening injuries and were medically evacuated to a Singapore hospital. The fifth person did not require further medical attention.
The US Navy 7th Fleet later issued a statement saying the USS John S McCain had now arrived at Singapore’s Changi naval base.
It said: “Significant damage to the hull resulted in flooding to nearby compartments, including crew berthing, machinery, and communications rooms. Damage control efforts by the crew halted further flooding.”