Three people including a woman and her son were burned to death and her daughter was critically injured in a fire at a house in the Syedpara area of Chittagong on Sunday.
The deceased were Nur Nahar Begum, 30, her son Maruf, 1, and neighbour Md Imam Uddin, 23.
They succumbed to their injuries while undergoing treatment at the burn unit of Chittagong Medical College Hospital (CMCH) at noon, Nurul Alam Ashiq, assistant sub-inspector at the hospital police outpost, said.
The condition of three-year-old Firiya, daughter of Nur Nahar, is critical, he said.
Ferdous Jahan, officer-in-charge of Bayezid Bostami police station, said the fire originated from a mosquito-repellent coil in the shanty of one Tota Miah around 4:30am and it engulfed two other adjacent shanties within minutes.
Upon receiving the information, police rushed to the spot, rescued four people and sent them to the hospital, he said.
Chittro Ranjan, chief leader of Agrabad Fire Station, said two firefighting units rushed to the spot and brought the blaze under control later.