Queensland shooting: Audio of police operation revealed

The audio from police helicopters reveals how helicopter crews guide officers on the ground towards the three offenders - later identified as former school principal Nathaniel Train, his brother Gareth and sister-in-law Stacey.

The six-hour siege on Monday began when police arrived at a rural property at Wieambulla in the western Darling Downs region at 4.30pm to follow up a missing person report about Nathaniel Train.

As officers approached, Constables Matthew Arnold, 26, and Rachel McCrow, 29, along with 58-year-old resident Alan Dare, were killed in a hail of bullets.

The following extracts of the PolAir recording were first reported by the ABC.

The audio recording starts with PolAir officers informing those on the ground that two people are armed.

"Both male, both armed and both discharging rounds towards white side," the audio states.

"Both males are down beside the couch and still with weapons pointing white side.

"The female unsighted.

"POI 1, main POI 1 (inaudible) weapons at the back of the utility.

"POI 1 with the one rifle now at the driver's door.

"Shots fired; further shots fired."

Ground crews are told there's a spotlight on top of a ute and weapons are being discharged. Then there's shots "a number of shots going off there. Continually every five seconds".

"No movement from number one. Still movement from number two.

"PolAir to SERT, two dogs coming white side, two dogs coming to you, white side.

"PolAir to SERT, there's still movement from number 2. Still lots of movement from number 2 on the couch."

Nathaniel Train, his brother Gareth and sister-in-law Stacey were shot dead by police at 10.30pm.

Circumstances surrounding the incident, including the deaths, will be investigated by police with the assistance of homicide detectives.

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The Train brothers' father Ronald Train said he was struggling to comprehend how his sons could be responsible for the murderous attack.

"I just could not understand how something like this could have occurred, with two children who had been raised by my late wife Gwen and myself," the retired pastor told Nine's A Current Affair on Wednesday.

Police trying to identify the motive for the lethal attack will trace the brothers' online activities, delving into extremist communities online.

"We'll investigate their families, their friends, everything they've done in the last six months to a year," Queensland Police Commissioner Katarina Carroll said.