Police searched the Australian bush on Wednesday for a heavily armed 56-year-old gunman still on the run a day after allegedly killing two officers and wounding a third.

Officers hunted through the night for the man identified as Dezi Freeman, who fled on foot into densely forested terrain after a shootout Tuesday morning in the northeast of Victoria state.

Police said they deployed "every resource" to find him, setting up a wide cordon at the scene, a rural property with a house and a bus in the small town of Porepunkah.

Freeman, described by local media as a radicalised conspiracy theorist, has survival skills and knows the area better than his pursuers, police said.

"The suspect for this horrific event is still at large," Victoria police chief commissioner Mike Bush told a news conf

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