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The explosion occurred early on Tuesday in the Chitashal area of the Bandar Upazila, said police.
The victims have been identified as ‘Raihan’, 35, his wife ‘Maya’, 28, and their 18-month-old daughter ‘Marium’, said Sub Inspector Mizanul Islam of the Bandar Police Station.
Fire service workers are investigating the scene of the fire, said SI Mizanul, but he could not yet ascertain the cause of the explosion. "We suspect there was a leakage in the pipe used for supplying gas. A fire may have triggered the blast."