At 7.13pm on Thursday (18) one crew from Ely and one crew from Littleport were called to a fire on Kings Avenue in Ely.
Firefighters arrived to find a well-developed fire in a shipping container. Wearing breathing apparatus they extinguished the fire using a hose reel and returned to their stations by 9.45pm.
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.