UPDATE, 8.30AM: Laidley State High School principal Michael Clarkson has confirmed damage from the overnight fire is minor and schoolwork would not be impacted today.
Mr Clarkson said the fire impacted the amenities block with some internal and ceiling damage due to smoke.
"We've had to move tuck shop to the hall today but there is no implications for students - lessons won't be affected," Mr Clarkson said.
Mr Clarkson said they were waiting on an assessor to check the damage to wiring in the building and they would need to relocate tuck shop tomorrow as the hall would be used for Queensland Core Skills (QCS) testing for year 12 students.
Mr Clarkson said the fire was disappointing.
"We don't like to see anyone damage our school," he said.
Four fire crews took two hours to put out the blaze which started around 9.45pm last night.
6AM: AUTHORITIES are treating an overnight fire at Laidley State High School as suspicious.
The Queensland Fire and Emergency Services were called to the school entrance at Alfred St, Laidley around 9.45pm last night.
They found a small fire which started in a rubbish bin which then spread to a "small structure".
QFES said four fire appliances attended the scene and the fire was brought under control around 11.30pm.
Last night, a man named Peter Pyke posted a tweet on Twitter to say that the "The Laidley Heights High School is on fire, toilet block and canteen."
When the Gatton Star checked out the scene at 6am this morning, there was no obvious sign of damage from the street.
The Fire Investigation Unit will be on the scene today to conduct inquiries.
The Gatton Star has requested further information from the school.
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