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A general view of the polluted Lanzhou section of Huanghe River in Lanzhou, capital of northwest China's Gansu Province October 22. A sewerage pipeline released red sullage to the river and the cause of the pollution is under investigation.

A sewerage pipeline releases sullage to the river.

Local residents look at the polluted river at the Lanzhou section of the Yellow River.

(China Daily October 24, 2006)