Detectives are investigating a large grass fire in Maribyrnong early on Sunday.
Emergency services were called to reports of flames seen coming from grassland near La Scala Avenue about 12am on January 26 .
Police were told a group of youths were setting off fireworks shortly before the fire started.
The offenders fled the scene on foot.
There were no reported injuries and several hectares of grassland were burnt.
Police are working to establish the exact circumstances surrounding the blaze, which is being treated as suspicious.
Anyone with information can contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au
