At 7.43pm on Sunday (24) one crew from Yaxley and one crew from Crowland in Lincolnshire were called to a fire on Norwood Lane in Paston, Peterborough.
Firefighters arrived to find a caravan well alight and extinguished it using hose reels. They returned to their stations by 9.15pm.
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.