The incident occurred on Harebeating Lane.
East Sussex Fire & Rescue Service has advised nearby residents to close windows and doors until the smoke clears.
Posting on Twitter, an East Sussex Fire & Rescue Service spokesperson said: “We are currently on scene at a barn fire on Harebeating Lane, Hailsham. There is currently a large plume of smoke. We are advising nearby residents to close windows & doors until the smoke clears.”
Photographer Dan Jessup was on the scene as firefighters tackled the blaze.
You can view a selection of his pictures in the gallery below.
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