A criminal investigation into the dumping of used oil upstream the Da River was initiated by police in Hoa Binh Province on Thursday.

The river is the source of fresh water for the Vinaconex Water Supply Joint Stock Company (Viwasupco), which supplies 250,000 families in 10 districts in southwestern Hanoi with drinking water.

They are searching for allegations of causing environmental pollution.

A 2.5-ton truck was seen dumping oil into a mountain stream at Phu Minh Commune, Ky Son District, on Tuesday last week. The distribution of oil polluted the Tram Stream and then the Dam Bai River, where ViwasupCO would store water for storage.

Two days later, residents of Hanoi find in their tap water a strange, pungent smell. Officials ' smelly water tests later found that styrene levels, an organic compound that is known to be carcinogenic, are 1.3-3.6 times higher than normal.

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News via vnexpress and photo courtesy ofsoha.vn