Police have been called in after a fire in a derelict shed off St Clare Street, Penzance on Sunday.
Firefighters from PenzanceFire Station used one hosereel to extinguish a small amount of rubbish on fire in the shed just after 4pm.
A spokesman said that arson is suspected and Devon & Cornwall Police have been informed.
Adding: "Arson puts both the public and firefighters at unnecessary risk. It ties up resources that could be in demand for other more serious incidents. A lot of Cornwall is covered by on-call firefighters so there is also a significant cost to each incident."
Anyone with information on fires being deliberately started are advised to anonymously call Crimestoppers free on 0800 555 111 or contact Devon & Cornwall Police on 101 with information.
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