Why did China's Yangtze River turn as red as tomato soup? Speculation points to sediment from flood erosion — or pollutants from a spill

[caption id="" align="alignleft" width="300"] English: Yangtze River as seen from Chongqing, China. Photo by User:Calton (Photo credit: Wikipedia)[/caption]

A stretch of China's longest river has abruptly turned the color of tomato juice, and officials say they don't know why.

Residents of the southwestern city of Chongqing first noticed

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