Thirty fire fighters battled a blaze at a barn in the grounds of The Warriner School last night.
Investigations are underway to find the cause of the fire in the barn which was used for storing hay, straw and machinery.
Oxfordshire Fire and Rescue Service were called to the scene at the secondary comprehensive about 1am this morning.
The large fire was said to be threatening neighbouring livestock sheds and an antique threshing machine.
One crew will remain at the scene throughout the day.
The school uses its 120 acre farm to teach students about agriculture and conservation.
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