Fire crews were called to tackle a blaze involving 50 tonnes of straw in Carlisle.
Carlisle East Fire Station was called at about 4.30pm yesterday to the fire to the rear of Warwick Road.
Firefighters suspect it could be an incident of arson.
A spokesman for Carlisle East fire station said: “Please be very careful disposing of smoking materials, and if using disposable barbecues be extremely careful, as the bottom of these get extremely hot and can easily spread to dry grass.”