At 7.51pm on Monday (27) one crew from Papworth was called to a fire on School Lane in Cambourne.
Firefighters arrived to find a fire involving a tree and extinguished it using a hose reel. They returned to their station by 11.55pm.
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.