Police believe accelerant was used to light a grass fire in Bardia Avenue, Seaford, on February 5.
At 12.30am a fire was lit on a small amount of rubbish in a grassy area of the avenue.
When CFA members arrived, they saw a white Suzuki Swift pull out from a nearby side street. Police are unsure if the vehicle was involved in the crime but would like to speak to the occupants.
A witness also reported seeing a male riding away on a pushbike. The cyclist is in his mid-20s and 190 centimetres with brown curly hair and wore a hoodie.
Information about the fire can be phoned to Detective Senior Constable Mark Garrett, 9784 5590 or Crime Stoppers, 1800 333 000.
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