Firefighters from both Mullion and St Keverne were called to reports of a gorse fire on the Lizard peninsula yesterday.
Reports came in at 12.17pm of a small gorse fire in the Kennack Sands area.
Beaters were used to extinguish the flames.
Nicola Thompson, from Cornwall Fire and Rescue, said: "The cause is believed to be deliberate and all details have been passed to Devon and Cornwall Police."
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