Akhir 07, 1432 / March 12, 2011, SPA -- A bus plunged into a river after being hit by a heavy-duty truck in northeast China's Jilin Province Saturday morning, killing 21 and leaving more than 20 injured, Xinhua quoted local authorities as saying. The accident occurred at about 9:50 a.m. in Wanliang Township of Fusong County when a heavy-duty semi-trailer rammed into a bus in front of it and knocked it down into a river, witnesses said. Twenty passengers died at the scene and one died later after emergency medical treatment failed. The injured have all been sent to hospitals. Local police are investigating the cause of the accident.