At 5.18pm on Friday (28) one crew from Dogsthorpe and one crew from Stanground were called to a fire on Edgerley Drive Road in Fengate, Peterborough.
Firefighters arrived to find a large pile of rubbish on fire and extinguished it using a hose reel. They returned to their station 6.10pm.
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.