Banyule Crime Investigation Unit detectives are appealing for public assistance following an explosion in Heidelberg Heights over the weekend.
Police have been told a loud bang was heard outside a house on Waterdale Road about 9.50pm on Sunday 19 July.
A resident went outside to investigate and put a small fire out near a tree caused by what is believed to be a home-made explosive device.
No one was injured.
Detectives are keen to speak to any witnesses or anyone with dash-cam footage that may have been driving in the area.
Anyone with information is urged contact Crime Stoppers on 1800 333 000 or submit a confidential crime report online at www.crimestoppersvic.com.au