A unit fire in Thomson is being treated as suspicious.
Emergency services were called to Birdsey Street just after 7pm Monday, finding the unit well alight.
It took FRV and CFA crews around 15 minutes to bring the flames under control.
Police and Ambulance Victoria were also called following reports of aggressive bystanders and an alleged assault on an occupant.
A 38-year-old Thomson man is helping police with their enquiries.
Arson and explosives investigators are expected to be on the scene today.
Anyone with information is being urged to call Crime Stoppers on 1800 333 000.
Picture: File image [Geelong Broadcasters]