Arson investigators suspect the blaze at Yale Primary School in Thornlie was lit deliberately.
Fire causes school closure
Police seek information about arson attack
The fire was lit in 2017.
Arsonist gets five years in jail
He admitted setting a building alight to help the owner make an insurance claim.
Arsonist sentenced in Supreme Court
A Perth man has been sent to Graylands after setting a couch on fire.