A DUMPER truck was set alight by arsonists on Friday morning.
Firefighters from Dearne station were called to the scene at a building site in Kirby Street, Mexborough, just before 2.30am.
They spent 20 minutes tackling the blaze using a single hose reel.
The crew managed to stop the fire from spreading to any other building equipment.
A spokeswoman for South Yorkshire Fire and Rescue Service said the blaze had been started deliberately.