A traffic collision involving four vehicles killed three people and injured 20 others, four severely, in south China's Guangxi Zhuang Autonomous Region Sunday, Xinhua quoted local government as saying. The accident took place at 11:30 a.m. on a street in the Xinjia Town of Jingxi County when a truck collided with two buses and another truck, said a spokesman with the county government. The injured are being treated at a local hospital, he said. The truck driver has been detained by police. The cause of the accident is being investigated, he added.