Chinese officials are considering building a dam to limit the impact of a toxic spill due to flow into Russia next week.
Last month, 100 tons of benzene and other chemicals spilled into China's Songhua (Soong-hwah) River, disrupting water supplies to
(m) millions of Chinese and straining relations with Moscow.
The official China Daily newspaper says the temporary dam would be built on a waterway that supplies drinking water to a Russian border city.
The ITAR-Tass news agency reports Russian officials think the pollutants will worsen after Saturday, when the front of the spill is expected to hit.
Hong Kong media report the vice mayor of the city where the chemical spill happened has apparently committed suicide.