At 4.42pm on Saturday (25) one crew from Stanground was called to a fire on Everest Way in Stanground, Peterborough.
Firefighters arrived to find a fire in the open involving two tree stumps. They extinguished the fire using a hose reel and returned to their station by 5.55pm.
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.