Arsonists torched a car filled with books in Dandenong North.
The CFA was called to reports of a burning car on the EastLink Trail at the rear of Lyndale Secondary College about 3am on Friday 2 December.
Firefighters extinguished the fire and located personal papers and books inside the car which had possibly been used to feed the fire.
Police have been unable to identify the vehicle, but believe it could be a Toyota Camry.
They urged anyone with information to call Crime Stoppers on 1800 333 000.