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Water in the middle and upper reaches of Beijiang River in South China's Guangdong province was found to contain excessive thallium, the Xinhua News Agency reported on Friday.
The heavy metal pollution is expected to affect the cities of Qingyuan and Guangzhou in the lower reaches, according to the report.
The water quality of Beijiang River's main stream is stable, said the Guangdong Environmental Protection Bureau. Water plants that may be affected by the pollution have taken measures to ensure the safety of their water supply.