The scene outside the fire at a karaoke bar in Cau Giay district, Hanoi, on August 1 afternoon. (photo: VNA)

The fatalities have been named as Dang Anh Quan, head of the Fire Prevention and Control Team of Cau Giay Police, Do Duc Viet and Nguyen Dinh Phuc. 

The fire started on the top floor of the six-storey building, which used to be a karaoke bar before closing for repairs. The three firefighters were reportedly trapped inside the burning building after a staircase collapsed.

The investigation into the case is ongoing.