ABOUT 35 firefighters battled a blaze at Rockingham Senior High School on last night.
It is estimated the classroom fire caused about $100,000 damage.
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A Department of Fire and Emergency Services spokeswoman said they were notified of the fire at 7.47pm by a member of the public, who said there was an area near an air conditioning unit on fire.
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Seven fire crews from Rockingham, Kwinana and Hope Valley attended and had the fire under control by 8.25pm.
The cause of the fire was deemed accidental.