SMOKE and heat damage to a classroom at Morley Senior High School is currently being repaired, with just two weeks to go until term one starts.
Arson Squad detectives are investigating the fire which happened on Sunday morning.
Detectives believe the fire was deliberately lit, following an assessment of the scene.
The initial estimated cost of the damage is $140,000.
Department of Education manager of security John Marrapodi said it was disappointing whenever “senseless” acts of arson and vandalism affected schools.
“The fire was contained to one classroom with mainly smoke and heat damage to the room,” he said.
“Smoke residue has also been located in seven classrooms and toilets.
“All damaged contents will be removed and replaced.
“Repairs are currently underway and if the work is not completed when school returns on February 4, alternative arrangements will be made.”
Mr Marrapodi encouraged members of the public to be vigilant and report any suspicious activity at their local schools to prevent vandalism to School Watch on 1800 177 777 or police on 131 444.
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.