China's third major toxic spill in as many months has threatened the water supplies to millions of residents of two central cities.
A clean-up accident last Wednesday allowed the industrial chemical cadmium, which can cause neurological disorders and cancer, to flood out of a smelter and into the Xiangjiang River in Hunan province.
The river supplies tap water to Changsha, which has about six million people, and Xiangtan city, with 700,000 inhabitants.
New toxic spill in China
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