At 1.43pm on Wednesday (23) one crew from Wisbech was called to a fire on Lynn Road in Wisbech.
Firefighters arrived to find a fire in a derelict outbuilding and extinguished it using a hose reel. They returned to their station by 2.30pm.
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.