At 6.29pm on Friday (28) one crew from March and one crew from Chatteris were called to a fire on Creek Road in March.
Firefighters arrived to find a fire involving two vans and a 4x4 vehicle. They extinguished the fire using a hose reel and returned to their stations by 8.15pm.
The cause of the fire was deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.