Queensland police are vowing not to be broken as investigations continue into how a missing persons call resulted in the death of two of their colleagues.

Detectives are still to determine a motive for the shooting deaths of Constables Rachel McCrow and Matthew Arnold and are examining links to online extremist conspiracy groups.

Thousands attended a moving ceremony with full police honours in Brisbane on Wednesday, where Police Chaplain Jeffrey Baills encouraged people to seek help if they were in need.

“We have had a major attack on the police in Queensland but, ladies and gentlemen, I want to say to us today: we will not be broken,” he said.

“We will, tomorrow, turn up to our shift and we will stand shoulder to shoulder again and seek to do the best we can to keep Queensland safe and fulfil our duties as outstanding men and women.”

The fallen constables were awarded valour medals at the ceremony that followed their tragic deaths at a rural property in western Queensland on December 12.

They went to the Wieambilla address alongside two other young constables to follow up on a missing persons call and were immediately met with gunfire.

Six people were dead by the end of the siege, including innocent neighbour Alan Dare who went to help and shooters Nathaniel Train, his brother Gareth and sister-in-law Stacey.

The events of December 12 “do not belong in this country”, Chaplain Baills said.

“It was absolute evil. This barbaric act has shocked our community, and it’s irreparably damaged the Arnold family and the McCrow family,” he said.