Fire has forced the evacuation of Mitchelton State High School in Brisbane's north-west.

Firefighters say the blaze broke out in a science laboratory around 8:30am (AEST).

A staff member raised the alarm when a fire broke out in a storeroom in the lower level of the science building.

Firefighters say the lab was well alight when they arrived.

More than 500 students and staff were evacuated.

Twenty-five firefighters took an hour to bring the blaze under control.

One firefighter has been taken to hospital with a minor wrist injury.

Queensland Fire and Rescue Service spokesman Bevan Moore says the building has sustained smoke damage.

"It was really important that it was isolated from the labs and we were able to do that because that's where we had risk for explosion," he said.

No-one else was injured.

The cause of the fire is being investigated.

Principal John Searle says the entire school was quickly evacuated.

"All students and staff are safe - they've been accounted for," he said.

"We did an evacuation as soon as the fire was reported."

Mr Searle says the school has been closed for the day.

"All parents have been contacted and all students can be collected from Mitchelton State School," he said.

 

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