Fire fighters try to put out "fire" on oil tanks during a fire drill at a chemical plant in Karamay, northwest China's Xinjiang Uygur Autonomous Region, Sept. 4, 2013. Fire fighting department in Karamay conducted a rescue drill based on the scenario of a fire accident on oil tanks in the plant on Wednesday. (Xinhua/Zhou Jianling)

A fire fighter works during a fire drill at a chemical plant in Karamay, northwest China's Xinjiang Uygur Autonomous Region, Sept. 4, 2013. Fire fighting department in Karamay conducted a rescue drill based on the scenario of a fire accident on oil tanks in the plant on Wednesday. (Xinhua/Zhou Jianling)

Fire engines try to put out "fire" on oil tanks during a fire drill at a chemical plant in Karamay, northwest China's Xinjiang Uygur Autonomous Region, Sept. 4, 2013. Fire fighting department in Karamay conducted a rescue drill based on the scenario of a fire accident on oil tanks in the plant on Wednesday. (Xinhua/Zhou Jianling)

Fire fighters try to put out "fire" on oil tanks during a fire drill at a chemical plant in Karamay, northwest China's Xinjiang Uygur Autonomous Region, Sept. 4, 2013. Fire fighting department in Karamay conducted a rescue drill based on the scenario of a fire accident on oil tanks in the plant on Wednesday. (Xinhua/Zhou Jianling)