Nearby residents have been warned to keep their windows and doors closed while a barn fire is tackled.
Cornwall Fire Service said it received calls just before 06:30 GMT about the incident on the outskirts of St Mabyn near Wadebridge, Cornwall.
It said crews from Wadebridge and Bodmin were sent to the scene and confirmed the barn contained hay bales which were “well alight”.
A Facebook post from Bodmin Community Fire Station said residents living nearby had been asked to shut their doors and windows due to the wind direction.
