FIRE investigators said a blaze which damaged ten cars in Sheffield was caused deliberately.
Explosions were heard by residents near the fire as it spread from vehicle to vehicle this morning.
Three fire crews were called to reports of a fire in the Oughtibridge Lane area of the city in the early hours.
They found four refrigerated lorries belonging to Samples Express alight with the fire quickly spreading to other vehicles parked nearby.
South Yorkshire Fire and Rescue Service said investigators had concluded the blaze was started deliberately.