A gas leak at an east China steel works Thursday left three workers dead and 10 injured, the government said, in the latest industrial accident to hit the nation. Carbon monoxide leaked from a pipeline into a gas tank at about 11:50 a.m., when 14 technical workers were performing maintenance work in the gas tank at the Meishan Steel Plant located in the city's Yuhuatai district, said a spokesman with the city's safety supervision bureau. Efforts at a local hospital to save three of the workers were ineffective, the statement said, while three others remain in serious condition and seven were out of danger of losing their lives. The causes of the gas leak is under investigation, the statement said.