East Sussex Fire and Rescue service has released details of what started a blaze at Plumpton College last week.
Firefighters were called to the scene, on Ditchling Road, at 7.30am on Thursday, July 30 and remained there until 6pm the following day (Friday, July 31).
More than 3,000 bales of hay were alight in a barn measuring 130 metres by 25 metres.
A spokesperson for East Sussex Fire and Rescue Service confirmed the fire was started by spontaneous combustion - caused by the way the hay had been stored combined with high temperatures.
Five crews attended the site, including one fire engine from Barcombe, the water carrier and fire engine from Uckfield, and one fire engine and the water carrier from Burgess Hill, from West Sussex Fire and Rescue Service.
They initially used hose reels and ground monitor to tackle the fire, before bringing in a mechanical digger to reduce the pile of hay and manage the incident.
Firefighters were also working to make the building safer by removing roof panels which were damaged in the fire.
There are no reports of injuries or animals being involved.
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