Arsonists are believed to have set fire to a caravan on the A142.
One crew from Ely and the south roaming fire engine were called to the blaze at Witcham Toll at 3.13pm on Saturday June 1.
Firefighters arrived to find a caravan well alight.
The crews used a hose reel to extinguish the fire and returned to their stations by 4.40pm.
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.
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