Maritime authorities on Friday said they have failed to locate six fishermen who went missing after their ship collided with another boat five days ago off China's east coast. A Zhejiang province-registered fishing boat with nine people on board collided with the Panama-registered cargo ship Tai Harvest at about 6:45 a.m. on Sept. 9 in the Yellow Sea, Xinhua quoted the Maritime Rescue Center of the city of Lianyungang in Jiangsu province as saying. Three fishermen were rescued from the sea within four hours of the collision. Authorities are still investigating the cause of the crash.