At 6.12pm on Saturday (23) one crew from Dogsthorpe and one crew from Stanground were called to a fire on Norwood Lane in Paston, Peterborough.
Firefighters arrived to find a caravan on fire and extinguished it using a hose reel. They returned to their stations by 7.20pm.
The cause of the fire is believed to be deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.