The blaze initially erupted at first floor of the factory, located in sector 16-B of New Karachi, and later it engulfed to the entire building.
According to sources, the fire intensified owing to delayed arrival of fire fighters at the spot. The reasons of the fire could not be known as yet.
Commissioner Karachi Shoaib Ahmed Siddiqui said at least 10 fire tenders were busy extinguishing the blaze, however he added that more fire fighting vans were required.
He ordered opening of closed hydrants so fire fighting operation could not be interrupted.