The person who deliberately set fire to a Wodonga hill, just 250 metres away from homes, put the lives of residents and emergency services as risk.
Detective Sergeant Graeme Simpfendorfer said firefighters and police were called to a fire on McFarlands Hill Track in the Felltimber Creek conservation reserve, just after 3pm on Tuesday which was promptly brought under control.
He said fire investigators were confident they had located the origin of the fire and that the fire was deliberately lit.
"There are no other reasons for that fire to have started," he said.
"We've eliminated all other causes and the only cause left for us is a direct ignition from available fuel.
"All these fires at this time of year are putting property and lives at risk, make no mistake, people can die."
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Detective Sergeant Simpfendorfer said police were reviewing a number fires in the nearby area which were deliberately lit in recent years, to see if they were related.
He said this was the first suspicious blaze in this fire season.
Despite being brought under control by fiefighters quickly, the fire reignited at about 11.20pm.
Police are looking to speak to anyone who was in the region around 3pm on Tuesday. Detective Sergeant Simpfendorfer said people gawking at fires hindered the efforts of emergency services.