New toxic spill in China

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.