Warning: This story contains details which some readers may find upsetting.
The video, titled “Don’t be afraid”, was uploaded to a now-deleted YouTube account but has since been reposted on an alternative sharing platform.
The footage appears to show Gareth and Stacey Train shrouded in darkness on the night of Monday’s shooting.
“They came to kill us. We killed them,” Gareth Train says in the video.
“If you don’t defend yourself against these devils and demons, you’re a coward.”
Stacey Train adds: “We’ll see you when we get home. We’ll see you at home, Don, love you.”
Queensland Police Union president Ian Leavers condemned the disturbing video and its publication online, saying the shooters wanted their “evil amplified”.
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”This vile murder confession from deranged anti-vaxxer, pro-gun, sovereign citizen conspiracy theorists should be instantly removed from media sites because that is exactly what these cold-blooded executioners wanted,” he said.
“They wanted notoriety, publicity and fame for their evil, deranged and insane views and they should be de-platformed immediately and not have their evil amplified.”
Constable Matthew Arnold, 26, Constable Rachel McCrow, 29, and neighbour Alan Dare were shot dead by Gareth, Stacey and Nathaniel Train during the attack at Wieambilla.
Nathaniel Train does not appear in the video posted online.
Constable Randall Kirk and Constable Keely Brough, both 28, managed to escape with their lives in what Commissioner Katarina Carroll later called a “miracle”.
It’s understood the Trains were already wearing camouflage gear when the shooting began.