Arsonist torched a van in Wolf Lane Wisbech on Sunday night.
A crew from Wisbech was called to the van on fire at 9.05pm.
Firefighters wearing breathing apparatus used a hose reel to extinguish the fire and returned to their station by 9.49pm.
Cause of the fire was deliberate.
Anyone with information should contact police on 101 or Crimestoppers on 0800 555 111.