Queensland Police officers are massing in Brisbane ahead of a memorial service for murdered constables Matthew Arnold and Rachel McCrow.
Thousands of people are expected to observe the service, which will be conducted with full police honours, for the two early-career officers, aged 26 and 29 respectively, on Wednesday.
Queensland Police Union head Ian Leavers said it was going to be a very difficult day for the families of the constables, who were gunned down at a rural property at Wieambilla on December 12, and the force.
"Matthew and Rachel will be side by side. They worked together, they died together, and they will be farewelled together," he told Nine's Today show on Wednesday.
"Police are travelling from all over southeast Queensland, as we speak, to attend, as well as from many other areas within the state.
"It will be a very emotional service and many hearts are going to be broken."
Queensland Police Minister Mark Ryan said the force was grateful for the show of support from the public following the tragedy.
"I don't think there is a single police station that hasn't had a truckload of flowers delivered to it," he said on Tuesday.
"It's been a tough week."
Some 8000 free tickets were made available to the public to attend the service, which will commence at 10am at the Brisbane Entertainment Centre and be attended by Police Commissioner Katarina Carroll, Premier Annastacia Palaszczuk and Opposition Leader David Crisafulli.
Thousands of officers are expected to stand on Melaleuca Drive to salute as the coffins pass into the grounds. The guard of honour will include a police band, mounted unit, dog squad, police vehicles, motorcycles and helicopters.
The ceremony will be broadcast live in a number of public places around Queensland, including in the communities of Tara, Dalby, Chinchilla and Miles near the site of the tragedy at Wieambilla, three hours west of Brisbane.
Ms Palaszczuk will deliver a message of condolence but the main focus will be on the eulogies for the officers.
Ms Carroll will read statements of service and make a presentation to the officer's families.
A minute's silence will be held before the service concludes.
Private funeral services will be held later.
Ms Carroll has said the two constables didn't stand a chance when they came under fire alongside two other officers, constables Keeley Brough and Randall Kirk, at the property.
They had gone to there as part of a missing persons check and were met by a hail of gunfire fired by Gareth Train, his wife Stacey and his brother Nathaniel.
Neighbour Alan Dare was also killed when he went to check on a fire lit to flush out Const Brough as she took cover in the bush.
The shooters later died in a firefight with specialist officers several hours after the four constables first arrived at the scene.
Investigators are yet to officially declare a motive but are examining known links between the Trains and extreme conspiracy theorist groups and forums.
© AAP 2022