JOHNSON CITY FIRE OFFICIALS ARE TRYING TO DETERMINE THE CAUSE OF A FIRE AT A CITY BUSINESS. A BLAZE BROKE OUT AT THE SNAP-ON TOOLS PLANT ON WATAUGA ROAD EARLY YESTERDAY MORNING. IT HAS BEEN DETERMINED THE FIRE BEGAN IN AN OIL VAT IN THE REAR PART OF THE PLANT. NO ONE WAS INJURED. THE CAUSE OF THAT BLAZE IS STILL UNDER INVESTIGATION.