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.”
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