Arsonists struck in the hamlet of Shippea Hill.
A van was torched at Shippea Hill Station at around 11.15am on Sunday.
One fire crew from Littleport attended the incident and arrived to find the vehicle well alight.
A spokeswoman for Cambridgeshire Fire and Rescue Service said: “Firefighters arrived to find the van on fire.
“Wearing breathing apparatus they extinguished it using a hose reel and returned to their station by 2pm.
“The cause of the fire was deliberate.”
Anyone with any information should call police on 101 or Crimestoppers, anonymously, on 0800 555111.