More pictures and video from Stamford School fire
Black smoke is pouring from a Stamford School building in St Paul's Street.
The fire took hold quickly after breaking out at about 12.30pm.
The building is the principal's home and part of it is the geography department.
St Paul's Street is taped off but about 30 people have gathered to watch in horror as firefighters continue their work.
Four fire engines and two fire and rescue cars are at St Paul's Street.
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