A 14-year-old boy has been arrested on suspicion of arson. He is currently being questioned in custody while enquiries continue.
Police say the area in and around the disused Overdale School in Eastfield, Scarborough, remains closed off to members of the public.
A police scene guard is expected to remain in place until Monday while enquires continue into the suspicious blaze.
The incident occurred at around 8.30pm on Friday.
Officers say if you can help the investigation, please call North Yorkshire Police on 101, select option 1, and speak to the Force Control Room.
Alternatively, contact Crimestoppers anonymously on 0800 555111.
Please quote reference 12220033765 when providing details.


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