Police will investigate the possibility officers were lured to a remote Queensland property where two constables and a member of the public were killed in a shooting rampage on Monday. 

Commissioner Katarina Carroll said investigators would also be looking at the online presence of the attackers, who were shot dead by police in a six-hour siege at Wieambilla, west of Brisbane. 

A police source said graphic body camera footage would be used to piece together how Constables Matthew Arnold, 26, and Rachel McCrow, 29, and neighbour Alan Dare died.

The Queensland Coroner and the force's Ethical Standards Command have launched investigations into Monday's attack by Nathaniel and Gareth Train, and Gareth's partner Stacey Train.

Commissioner Carroll told the ABC's 7.30 program police would "get to the bottom" of what happened, including whether the trio had planned the attack. 

"We're definitely investigating every avenue, whether it be premeditated, some of the stuff that's online from these people. We will investigate what they have been doing not only in recent weeks, but in recent years, who have they been interacting with, family, friends, their online presence,” Commissioner Carroll said.

The four officers had gone to the remote property to investigate a report about Nathaniel Train going missing from New South Wales in October when they came under fire.

Their attackers appeared to be well-armed with a large calibre weapon and had a security camera system set up to alert them to anyone entering the property, the source said.

The two officers were shot without warning, as was a neighbour Alan Dare, who walked to the property's boundary after seeing cars on fire on the remote property.

Commissioner Carroll said the four officers were "quite junior" but were comfortable with taking on what they believed to be a business-as-usual missing person job. 

"I know that the officer in charge also spoke to them, so they were quite comfortable going out to the property and in fact, from what I understand, quite jovial and having fun with each other. For us, this was a standard job," Commissioner Carroll said.

Asked what the preparation would have been for the officers before heading out to the job, she said a risk assessment had been carried out.

"We will always do a risk assessment, run those required checks to make sure that we have all the information that we need. And that was done on this occasion. They were comfortable going to this job as a BAU [business as usual] job," she said.

'She did not know if she would be shot or burned alive'

One of the officers managed to flee and raise the alarm despite being hunted by the attackers.

The officer, a young policewoman, was highly praised by Queensland Police Union president Ian Leavers.

"She did not know whether she was going to be shot or [if] she was going to be burned alive, '' he said.

"I do know she was sending messages to loved ones saying she was at a point where she thought it was her time. What was going through her mind, one cannot comprehend."

Commissioner Carroll late yesterday said she would meet with the families of slain officers today.

She said the investigation into the shooting would "take days, if not weeks" and there would be a coronial inquest.

"We will go back, revisit every aspect of this … what we know about these people, how we responded, were they known to us?"