According to the police, the incident occurred in the Sundar Industrial Estate area near Raiwind.
As a result of the explosion, the three-story building of the factory collapsed while windowpanes of nearby buildings were also broken.
After being informed, the fire brigade and rescue teams reached the spot and started an operation to clear the debris. Rescue teams retrieved a dead body from the rubble while four persons were pulled out in the injured condition.
Later, the rescue teams shifted the dead and injured to a nearby hospital.
Earlier, A man was killed, and six persons were injured when a cylinder exploded in Mithdar police station jurisdiction in Karachi.
The loud explosion in a shop at the generator market in front of the Karachi Chamber of Commerce also damaged the building and nearby vehicles and rocked the area.
Fire erupted in the shop after cylinder blast and things at the shop were spread over the road.