Police officers said the accident happened on National Highway-31 near Chitrakoli village under Rajauli police station in the district and the victims were local residents of the Dibour Ghati village.
"The collision was so severe that the van was badly crushed. The four seem to have died instantaneously, while the three in critical condition have been admitted to a Primary Health Centre (PHC) in the area," said Rajauli Deputy Superintendent of Police (DSP) Sarfur Rehman.