Arson is suspected following a barn fire at Ruan Minor on Wednesday.
Firefighters from Mullion and St Keverne were called out to the barn on a farm near the village just after 6.30pm on Wednesday.
Two pumping appliances from Mullion and pumping appliance fwere drafted in to the scene.
Crew used breathing apparatus and a hose eel to extinguish the fire.
As arson is suspected, the police were informed.