An Indonesian-registered tanker and a Dominican-registered dredger have collided in Singapore territorial waters, about 1.7 nautical miles south-west of Sisters' Island. The dredger capsized and is still partially submerged. Twelve crew members - 11 Chinese nationals and one Malaysian - were on board. Seven of the Chinese nationals have been rescued and transferred to the Singapore General Hospital for medical treatment. The remaining five crew members remain unaccounted for. The tanker was damaged, but its 26 Indonesian crew were unhurt.