Chilling footage appearing to show two of the shooters responsible for killing a pair of Queensland police constables has emerged as funeral details for the fallen officers are confirmed.

The video has been labelled a a "vile murder confession" by Queensland Police Union president Ian Leavers, who called for the footage to be removed from media sites immediately.

"This is exactly what these cold-blooded executioners wanted," he said in a statement on Friday.

"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."

The video from a now-deleted Youtube account shows a couple with a likeness to killer couple Gareth and Stacey Train speaking with little emotion about the attack.

The footage was uploaded on Monday after constables Rachel McCrow and Matthew Arnold had been fatally shot but before details of the attack at a rural property in Wieambilla had been reported.

Gareth Train's brother Nathaniel, who was also involved in the shooting, does not appear in the video.

While it may be legitimate to report the existence of the video, Mr Leavers said broadcasting it was irresponsible.

A funeral service with full police honours will be held in Brisbane for the fallen officers just before Christmas.

The two constables and local resident Alan Dare were gunned down in what investigators believe was a premeditated attack at the remote home in the Western Downs region.

Two more officers, constables Randall Kirk and Keeley Brough, escaped despite coming under fire.

All three of the killers died dressed in camouflage in a firefight with heavily armed tactical officers.

Wednesday's funeral service will be held at the Brisbane Entertainment Centre.

Residents of towns near Wieambilla will also gather to pay tribute to the victims of the shooting tragedy.

Planned Christmas celebrations at Tara will also become a time to remember those who died, while in Chinchilla residents will gather for a candlelight vigil to connect and support community members.

Western Downs Mayor Paul McVeigh said the community was deeply saddened but would come together in tribute.

"The outpouring of support and gestures of sympathy and condolences from the residents and businesses of Chinchilla and Tara have been heartwarming at a time when such pain and sadness is being felt," he said.

Queensland Premier Annastacia Palaszczuk is taking advice from the police commissioner about when to visit the affected communities, Attorney-General Shannon Fentiman said.

"I'm sure the premier will get out there when she takes that advice when it is best to do so," Ms Fentiman said.

While the community mourns, Australia's national security agencies have turned their focus to the role online radicalisation and extremism played in the ambush.

Police continue to probe the Train brothers' online activities, including their possible involvement in extremist conspiracy groups and forums.

Home Affairs Minister Clare O'Neil said security agencies were "actively considering" the implications for national security.

"It's really important that we let law enforcement and national security agencies do their job, (but) once the picture does start to clarify, it is likely that radicalisation will form a part of it," she told parliament on Thursday.

"It is absolutely clear ... that conspiracy theories, disinformation and misinformation ... are being turbocharged by technology into terrible acts of violence."

Opposition Leader Peter Dutton, a former Queensland police officer, likened the killer trio to Islamic extremists and raised serious concerns about online radicalisation.

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Prince Harry and his wife Meghan have piled criticism on the royals in new episodes of their documentary series, accusing his elder brother Prince William of screaming at him during a summit to discuss his future.

In the final three episodes of the Netflix series, Harry also said aides for William, now heir to the throne, had been complicit in negative stories appearing about the couple in the media and blamed the press for Meghan having a miscarriage.

"It is a dirty game. There's leaking but there's also planting of stories," Harry said.

"So if the comms (communications) team want to be able to remove a negative story about their principal, they will trade and give you something about someone else's principal."

He and William had seen what had happened with the office of their father King Charles, whose first marriage to their mother Princess Diana broke down in the full glare of the media amid counter-briefings from both parties, and agreed never to repeat it, Harry said.

"I would far rather get destroyed in the press than play along with this game, or this business of trading," Harry said.

"To see my brother's office copy the very same thing that we promised the two of us would never ever do, that was heartbreaking."

The Duke and Duchess of Sussex, as Harry and Meghan are officially known, stepped down from royal duties in March 2020, saying they wanted to forge new lives in the United States away from media harassment.

He recounted details of a crisis summit held at the Sandringham estate two months earlier he attended along with the late Queen Elizabeth, Charles and William.

"It was terrifying to have my brother scream and shout at me, and my father say things that just simply weren't true and my grandmother quietly sit there and sort of take it all in," he said.

A royal source also said neither the palace nor representatives of William or other royals had been approached for comment for the series itself, contradicting a Netflix statement that said they had declined to comment.

Meghan spoke of how she had been driven nearly to suicide while Harry said they had received incredible abuse for not serving "our child up on a silver platter" by showing off son Archie to the media immediately after his birth.

Harry said how, after a newspaper story appeared that said William's bullying was a reason why Harry and Meghan wanted to leave, a joint statement had been issued on behalf of both brothers to deny it without his approval.

"No one asked me permission to put my name into a statement like that," Harry said, saying Meghan had burst into tears when he told her.

"Within four hours, they were happy to lie to protect my brother. And yet, for three years, they were never willing to tell the truth to protect us."

In another scene, the couple were shown talking about a former senior aide to William providing evidence in a successful privacy lawsuit Meghan had brought against the Mail on Sunday newspaper for publishing a letter she had written to her estranged father.

In his evidence the former aide, Jason Knauf, who had also worked for the couple, suggested Meghan had been aware at the time that the letter could leak, casting doubt on her account.

"It's your brother. Not gonna say anything about your brother but it's so obvious," Meghan said.

Netflix included a statement from a representative for Knauf that said the claims were "entirely false".

Harry also said he believed the stress of the case against the paper had caused Meghan to lose their baby.

"I believe my wife suffered a miscarriage because of what the Mail did," he said.

"I can say from what I saw, that miscarriage was created by what they were trying to do to her."

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A funeral service with full police honours will be held just before Christmas for two officers who were gunned down in an attack on Queensland's Western Downs.

The service will be held on Wednesday in Brisbane for constables Rachel McCrow, 29, and Matthew Arnold, 26, the force confirmed late on Thursday.

Constables Arnold and McCrow and local resident Alan Dare, 58, were gunned down at a rural property at Wieambilla, between the towns of Tara and Chinchilla, on Monday.

Officers Randall Kirk and Keeley Brough, both 28, escaped with minor physical injuries.

Their killers - Nathaniel, Gareth and Stacey Train - died in a firefight with heavily armed tactical officers.

Wednesday's funeral service will be held at the Brisbane Entertainment Centre.

Residents of Tara and Chinchilla will also gather to pay tribute to the victims of the shooting tragedy.

Planned Christmas celebrations at Tara will also become a time to remember those who died.

"We hope the community can rally together in a time of despair and support each other through this tough time in the lead-up to Christmas," organisers said as they urged locals to attend.

Nearby, Chinchilla residents will gather for a candlelight vigil to connect and support community members.

Western Downs Mayor Paul McVeigh said the community was deeply saddened but would come together in tribute.

"The outpouring of support and gestures of sympathy and condolences from the residents and businesses of Chinchilla and Tara have been heartwarming at a time when such pain and sadness is being felt," he said.

While the community mourns, Australia's national security agencies have turned their focus to the role online radicalisation and extremism played in the ambush.

Police continue to probe the Train brothers' online activities, including their possible involvement in extremist conspiracy groups and forums.

Home Affairs Minister Clare O'Neil said security agencies were "actively considering" the implications for national security.

"It's really important that we let law enforcement and national security agencies do their job, (but) once the picture does start to clarify, it is likely that radicalisation will form a part of it," she told parliament on Thursday.

"It is absolutely clear ... that conspiracy theories, disinformation and misinformation ... are being turbocharged by technology into terrible acts of violence."

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Three shooters were prepared with high-powered military-grade weapons and a sophisticated surveillance system during a lethal showdown at a remote Queensland property that left six people dead.

Killers Nathaniel, Gareth and Stacey Train rigged up their rural home at Wieambilla in preparation for the lethal attack on four officers responding to an interstate missing persons report, the police union said.

Forensic examinations are continuing at the house in the western Darling Downs, where constables Matthew Arnold and Rachel McCrow and neighbour Alan Dare were gunned down on Monday.

Queensland Police Union president Ian Leavers said investigators believe the Train family planned the attack and were armed and ready to face a police assault.

"It was a sophisticated surveillance system and that is very, very concerning to us - knowing that this ruthless, murderous trio went to this extent with a view, I firmly believe, to take police out," he told ABC Radio on Thursday.

Mr Leavers said he didn't want to hamper the police investigation into the incident, but police were very concerned about the attack.

"It's sickening to know the lengths this murderous trio went to," he said.

Constable Keely Brough, 28, escaped the ambush by hiding in long grass, which the shooters set alight in an attempt to force her out, and is now recovering with her family.

Her colleague, Constable Randall Kirk, who also got away, is recovering at home with his daughter and pregnant wife after having surgery to remove shrapnel from his leg.

Mr Leavers said Const Kirk might need further operations, but both officers were doing as well as could be expected.

Queensland Police Commissioner Katarina Carroll met with the families of constables Arnold and McCrow and has learnt a great deal about the fallen officers.

"The families are amazing people who had children who wanted to do great things in life," she said Thursday.

Details about a memorial service for the fallen officers are expected in coming days, while community gatherings are planned for Tara and Chinchilla, near Wieambilla, on Friday.

Western Downs mayor Paul McVeigh said the community was deeply saddened by the tragedy but had come together in tribute.

"The outpouring of support and gestures of sympathy and condolences from the residents and businesses of Chinchilla and Tara have been heartwarming at a time when such pain and sadness is being felt," he said.

Political leaders paused to honour the police officers killed in the shooting tragedy in federal parliament, including a tearful tribute from Opposition Leader Peter Dutton.

Mr Dutton, a former Queensland police officer, said three wonderful Australians had paid the ultimate price while serving their community.

"Three people who embodied compassion, commitment and courage during their lives and in their final moments," he said.

Home Affairs Minister Clare O'Neil said while authorities searched for answers, the national security implication of online extremism would have to be examined.

"There will be important questions we will need to consider on how our country deals with acts of violent extremism, but today is not the day," she said.

"Today is a day for grieving."

Police trying to identify the motive for the lethal attack have been tracing the brothers' online activities, including posts in the name of Gareth Train that featured a mix of conspiracy theory-laden material.

The Train brothers' father Ronald Train said he struggled to comprehend how his sons, who cut ties with him 23 years ago, could be responsible for the killings.

"They went down this track, this dark track, which we have no understanding of," he told Nine's A Current Affair program.

The now-retired pastor officiated at the wedding of Nathaniel and Stacey some years ago, adding he was surprised by reports his older son Gareth was now married to the same woman.

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