Zing online newspaper reported that police said one worker received serious injuries while most managed to self-evacuate when the fire was first discovered on an assembly line.
A fire services spokeswoman confirmed the building was well engulfed by flames when crews arrived at the scene. But she was unable to detail the extent of the damage to the 1,000-square metre facility.
The spokeswoman said the fire spread rapidly to adjacent areas of the plant and damaged is expected to be extensive.
Witnesses taking a lunch break reported seeing a welder near the vicinity where the fire started shortly before they smelled smoke, looked up and saw flames shooting every which direction.
