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. The tanker has a tonnage of 30,000 which is about three times that of the USS John S McCain's, and at 600ft (182m) it is slightly longer than the 505ft-long US destroyer. What is happening now? US military helicopters as well as the Singaporean and Malaysian navies and coast guards are currently conducting search and rescue operations. 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 ship is now sailing under its own power and heading to Singapore's Changi naval base. The Alnic MC is making its way to Singapore's port. One crew member of the oil tanker told Reuters over the phone that the vessel sustained some damage to a valve. The ship was carrying nearly 12,000 tonnes of oil from Taiwan to Singapore, the news agency reported.