The information was announced by deputy director of the provincial Department of Public Security, Nguyen Huu Duc, at a press conference held on October 17.
The police official revealed that they have summoned some suspects involving in the oil dumping and the case is still under investigation.
"We will announce more details after the investigation completes," he said.
Nguyen Dang Khoa, deputy director of the Vinaconex Water Supply Joint Stock Company speaks at the conference
Speaking at the press conference, Nguyen Dang Khoa, deputy director of the Vinaconex Water Supply Joint Stock Company which operates the Da River Water Plant refused to apologise and provide compensation to customers. He said that the company was the hardest-hit by the incident.
The Tram Stream near the Da River Water Plant
On the evening of October 8, local people in Ky Son District saw a 2.5-tonne truck discharging waste oil into the Tram Stream which lies about 800 metres away from a reservoir of the Da River Water Plant.
On October 10, residents in some districts in Hanoi reported a smell similar to burning plastic coming from their tap water supplied by the plant.
On October 15, authorities in Hanoi announced their investigation results which showed that tap water had styrene levels of between 1.3-3.6 times higher than normal in some areas.
Around 250,000 households in Hanoi are using tap water supplied by the Da River Water Plant.
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