ARSON Squad detectives are investigating a fire at Morley Senior High School on Sunday morning.
Just after 3.30am, alarms at the school were activated.
Police and security staff went to the school and confirmed there was a fire in one of the classrooms.
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READ NOWThe Department of Fire and Emergency Services attended the scene and extinguished the fire.
Detectives believe the fire was deliberately lit, following an assessment of the scene.
Anyone with information or who saw or heard anything suspicious around the school is urged to call Crime Stoppers on 1800 333 00 or make a report online at www.crimestopperswa.com.au.
Rewards of up to $50,000 are available for information that leads to the identification and conviction of an arsonist.