Four people died and six were injured when a bus collided with a coal truck in north China's Inner Mongolia Autonomous Region on Friday afternoon, Xinhua reported. The bus with about 30 people aboard, crashed into the compartment of a truck carrying 60 tonnes of coal in Xinchengzi Town, Linxi County, at 4:40 p.m., according to Liu Zuodong, a firefighter who had joined the rescue operation. Among the dead were the bus driver and three passengers. Six others were injured and were receiving treatment in hospital. The cause of the accident was being investigated.