SHIJIAZHUANG - A road accident killed six people, injured another 23 in north China's Hebei Province Tuesday, local government said.According to the publicity department of Xingtai County, the accident occurred at 5:40 p.m. when a passenger coach collided with a truck on a provincial highway. Two people were killed instantly and four died in hospital.Another 23 are receiving treatment.Investigation into the cause of the accident is under way.