The deceased were identified as Polash, 12 and Tushar, 7. Both of them are children of Iqbal Hossain, 55.
Jatrabari Police Station OC Kazi Wazed Ali said that a fire broke out at a Teenshed house on Council road area of Matuail.
On information, two firefighting units rushed to the spot and doused the fire after 1-hour frantic efforts. Later, the bodies of the siblings were recovered.
It is initially thought that the fire originated from mosquito coil.