Nathaniel had been a teacher in NSW,before leaving his job and partner and moving to live with his ex-wife Stacey,who had begun a relationship with Gareth.
The brothers’ estranged father is a Christian pastor who had not seen his sons for years.
The Trains,who referred to police as “monsters and demons”,had initially been thought to be sovereign citizens,which Linford said was an understandable characterisation at the time,given the family displayed typical traits including anti-government views and withdrawal from society.
She said police had also found “significant evidence of advance preparation and planning” before the shootout.
“To give you some idea of what that looked like,on the property there were camouflage hides,where we believed periodically one of the three members would lie in wait,” she said,adding the Trains also had camouflage clothing and there were “well-worn tracks” between the hides.
“There were multiple erected barriers,some of those were dirt mounds,some of those were logs.
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“They had CCTV footage. The gates were locked. They had mirrors on trees – we suspect that was to help alert them if vehicles were travelling down the road.
“They had radios. We even located a trapdoor under the house which might have enabled an easy escape.”
Police also found six firearms on the property.
Linford said a Chinchilla police officer had earlier attended the property,but because the gate was locked,he wrote a note and waved at the Trains’ cameras to alert them before putting his contact details in their mailbox.
He later called them,Linford said,and then went back to the property a week later,where he found the note still in the mailbox.
“So that led him to believe that no one was at the property and as a consequence that’s why a warrant was issued for Nathaniel over the firearm offences,” Linford said.
While the Trains acted alone,Linford said the family had posted on social media,and people in the US had responded.
Linford said Queensland police had also met with the FBI and provided information to them.
More than 190 statements have been taken by police and the coroner will investigate the deaths and the liaison between NSW and Queensland police.