The fire broke out on the 6th floor of a six-storey building around 12:30 am at Masdair Patanger more area in Fatullah, said Station officer of Mondolpara fire service Belal Hossain.
The injured are Mishal,26, a garment worker, his wife Mita,23, their one and a half year old child Minhaj and Mishal’s two brother-in-law- Mahfuz and Sajib.
Belal Hossain said neighbours extinguished the blaze before they reached the spot.
“The fire gutted most of the furniture of the flat and the injured were rushed to the Burn Unit of Dhaka Medical College Hospital,” he said adding that they are trying to know the origin of the fire.
Family sources said the fire might have originated from a leakage in the gas line of the flat.