A fire at Bayside P-12 College in Altona North early on Saturday morning is being treated as suspicious.
Firefighters arrived at the scene at about 3.30am on 25 October after callers to triple-0 reported a fire at the school.
Crews found a building within the school grounds engulfed in flames and donned breathing apparatus to attack the blaze.
The fire was brought under control by about 3.45am and firefighters remained on scene for several hours afterwards while it was fully extinguished.
Police were then requested to attend the scene to investigate suspicious circumstances surrounding the fire.
The investigation remains ongoing.
