Arsonists destroyed a barn in Wisbech last night (Tuesday).
The blaze started at about 10.50pm in North Brink, Wisbech.
Crews from Cambridgeshire Fire and Rescue were aided by colleagues from Norfolk to tackle the inferno.
The 50x20m ban was completely destroyed in the fire.
An investigation revealed the fire was started deliberately. Anyone with information is asked to call police on 101, or Crimestoppers, anonymously, on 0800 555 111.