Staff members test water samples at Veolia Water, the sole water supplier for more than 2 million people in urban Lanzhou, capital of northwest China's Gansu Province, April 11, 2014. (Xinhua/Chen Bin)
Investigators have blamed oil leak from a subsidiary of CNPC, China's largest oil and gas producer and supplier, for the tap water contamination that affected more than 2.4 million people in Lanzhou since Friday.
A crude oil leak from one of the oil transmission pipelines owned by Lanzhou Petrochemical contaminated the source water that fed a local water plant, and brought hazardous levels of benzene in the city's tap water, said Yan Zijiang, Lanzhou's environmental protection chief, at a conference call with the city government Saturday.
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