A crime scene has been established after a suspicious fire caused significant damage to a state school in Gympie overnight.
Emergency services were called to the blaze at the John Street primary school around 11.40pm.
Police said the fire destroyed C Block which was fully engulfed when first responders arrived. A nearby shed was also damaged.
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Gympie detectives are urging anyone who may have noticed anything suspicious in the area around the time of the fire to contact police.