The fire broke out due to boiler explosion at the four-storey Tempako Packaging Factory around 6:15 AM in Bisic industrial area of Tongi, said Gazipur Fire Service and Civil Defence Deputy Assistant Director Akhtaruzzaman.
A part of the building collapsed as the rage of the blaze spread despite frantic efforts of the fire fighters.
At least 21 people were killed and 50 others sustained burn injuries, hospitals sources said.
Thirteen of the 21 dead have now been identified.
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While 30 burnt victims were rushed to Dhaka Medical College Hospital, 10 others shifted to Kurmitola Hospital, said the residential physician.
Ten of the injured are struggling for life with critical burn wounds, officials said.
Twenty units of firefighters were trying to douse the fire but they could not manage to douse the blaze till noon.
Flames and smoke were seen billowing out of the factory, six hours after the fire started. The fire service said strong winds had fanned the flames.
The factory produced and printed the plastic packaging for food items like potato chips and small household goods including mosquito coils.
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