A taxi driver and his three passengers were found dead in a car recovered from a roadside lake in the northern province of Lang Son on Monday morning.
Locals found the taxi at around 10 a.m., when it lied upside down at the part around two meters deep. Rescuers spent nearly two hours lifting the car.
Police suggested that the car plunged into the lake after midnight the same day.
The 40-year-old driver Dam Hong Quang was dead, so as all three male passengers - Nguyen Ngoc Hieu, 36, Linh Hoang Khanh and Vi Van Tam, both 33. All the victims are Lang Son locals.
Police are investigating the cause.