A shooting ambush in a remote Australian town that left six people dead has been declared a religiously-motivated terrorist attack.

Authorities say it is the first time Christian extremist ideology has been linked to a terror attack in Australia.

Two police officers and a neighbour were killed when Nathaniel, Stacey and Gareth Train opened fire on a rural property in Queensland last December.

The trio were shot dead after a lengthy stand-off with police.

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