A passenger bus plunged off a cliff in the northern Vietnamese province of Cao Bang on Sunday, killing four people and injuring 16 others, with the country’s traffic safety watchdog demanding that legal proceedings be initiated against those responsible.

The sleeper bus of Duyet Thuy Bus Line was traveling on the section of Cao Bac Pass in Nguyen Binh District, Cao Bang at around 6:00 am when it fell off a 30-meter high cliff.

Three people were killed on the spot while another died on the way to the hospital.

Sixteen victims were injured. Three passengers with the most serious wounds are being treated at the Cao Bang Province General Hospital.

The bus was heavily damaged following the accident.

Competent authorities have launched an investigation into the case and are collecting statements from the driver, Tran Van Thang, to determine the cause of the crash.

Deputy Prime Minister Truong Hoa Binh, who is also head of the National Committee for Traffic Safety, on the same day extended his condolences and support towards the victims.

Khuat Viet Hung, deputy head of the committee, considered the case an especially serious accident and has requested the Cao Bang police department to begin legal procedures against the bus driver and his transport business.

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