Three people have been killed and five others injured by gas leak in a steel plant in north China's Hebei province, local authorities told Xinhua Friday. The accident happened at about 9:30 p.m. Thursday at Puyang Steel Co., Ltd. in the city of Wuan, according to sources with the municipal government. Gas leaked from a stove under overhaul, leaving eight people poisoned. Three of them died in hospital. Local authorities have set up a team to investigate the accident.