Investigators work at spot of oil leak incident in NW China
Investigators work at the spot of accident in Lanzhou, capital of northwest China's Gansu Province, April 12, 2014. A subsidiary of China National Petroleum Corporation, China's largest oil company, is being blamed for an oil leak which contaminated tap water in Lanzhou on Friday, affecting 2.4 million people. (Xinhua/Chen Bin)
Photo taken on April 12, 2014 shows the disposal wells of polluted channel in Lanzhou, capital of northwest China's Gansu Province. A subsidiary of China National Petroleum Corporation, China's largest oil company, is being blamed for an oil leak which contaminated tap water in Lanzhou on Friday, affecting 2.4 million people. (Xinhua/Chen Bin)