At 8.28pm on Thursday (18) crews were called to a fire on Northey Road in Flag Fen, Peterborough.
Crews from Dogsthorpe, Stanground, Whittlesey, Thorney and a water carrier from Ramsey attended the scene.
Firefighters arrived to find a well-developed fire spread over a large area involving outbuildings, cars, a tractor and a caravan. Around 40 doves were found in one of the buildings and were safely released.
The crews extinguished the fire and returned to their stations by 11.40pm.
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.