Crews from Stanground, Dogsthorpe, Ramsey and Whittlesey were called to a fire in a derelict building at an old mushroom farm in Station Road.
Firefighters wearing breathing apparatus used two covering jets, a Multistar appliance and set up a water shuttle to extinguish the fire before returning to their stations by 9.21pm.
Crews returned this morning to inspect the site.
Station Commander Gavin Hammond said the cause was arson and warned: “Deliberate fires put lives at risk.”
Cyclist seriously injured in Cherry Hinton collision
A 45-year-old woman has been seriously hurt in a bike crash in Cherry Hinton
Woman in critical condition after five-car crash on A14
A woman is fighting for her life following a five-car pile-up near Newmarket.
Fears Cambridge market could shrink following revamp
Traders fear £12.6m plans to upgrade Cambridge Market Square will result in it shrinking.
Woman found dead in Little Shelford
A man has been arrested after a woman was found dead in Little Shelford.
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