Both the labourers were making crackers on the roof of the factory when the incident occurred at around 2.15 PM, they said, adding the fire quickly spread and a portion of the factory's roof blew off.
Abhishek alias Munnu, a resident of Bihar, sustained around 80 per cent burn injuries and was rushed to Amritsar in serious condition, police said.
The fire was later doused, they said.
The factory is located just 100 mt away from a school. Following the incident, school authorities did not allow its students to leave the school till the fire tenders doused the flames.
Civil lines police station SHO Yadwinder Singh said a police team has been sent to Amritsar to record the statements of the injured and on the basis of which action will be taken against the accused.
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