Tragedy At China's Refinery

Three people were deadly poisoned, two else were severely wounded by unidentified gas produced in oil refinery in Maoming City, South China.
All injured people were found lying on the ground of the workshop at 8 a.m. Monday. Two were in coma, three were dead.
Medical examination of them shows that they were poisoned by some unidentified gas, may produced during the process of oil refining.
The oil refinery where the accident occurred is a private one, using waste oil, diesel and crude oil to produce various oil products. Treatment of the two injured and investigation into the accident causes are underway.