The ACT government will launch an independent inquiry into how the prosecution of the man accused of raping ex-Liberal party staffer Brittany Higgins was handled.

Bruce Lehrmann faced a trial in the ACT Supreme Court in October which was derailed due to juror misconduct in October.

The charges against him were later dropped because of concerns about the impact a second trial would have on Ms Higgins' mental health.

Mr Lehrmann denied the allegation he had raped Ms Higgins in Parliament House in 2019.

After dropping the charges, it emerged ACT Director of Public Prosecutions Shane Drumgold had raised concerns about "political and police conduct" in the case.

He also wrote to the territory's police chief accusing his members of pressuring him not to prosecute Mr Lehrmann.

But the police union hit back at the allegations and accused Mr Drumgold's office of compromising Mr Lehrmann's trial.

ACT Attorney-General Shane Rattenbury told reporters he was concerned the allegations raised by both parties about the case may have wider implications for similar cases in the territory.

He said the territory government wanted to ensure criminal matters were prosecuted in a way that was robust, fair and respected the rights of those involved.

The government also wanted to ensure criminal justice entities in the ACT worked together effectively.

But Mr Rattenbury emphasised the inquiry was not about reviewing the trial, evidence presented or outcomes.

"This trial has been very stressful for all involved," he said.

"While it's important that we do explore the allegations that have arisen in recent weeks ... at the end of the day all the parties involved are human and they do deserve to be treated with a degree of care and respect."

ACT Chief Minister Andrew Barr said an inquiry would investigate whether the functions of the territory's criminal justice system were "discharged with the appropriate rigour, impartiality and independence".

A board of inquiry will examine interactions between prosecutors and ACT Police regarding the charges against Mr Lehrmann as well as the decisions to go ahead with a first trial and then not proceed with a retrial.

It will examine how the Victims of Crime Commissioner responded to the allegations and supported Ms Higgins.

Laws in the ACT related to juror misconduct are also expected to be examined.

All parties have indicated they will cooperate with the inquiry.

The government will announce a legal expert to oversee the matter, as well as the full scope of the investigation next year.

It is expected the inquiry will hold public and private hearings.

A spokesperson said ACT Policing looked forward to engaging with the inquiry in coming months.

Mr Rattenbury said the prosecutor's office and the police force had a long, ongoing relationship and the allegations from both sides were serious.

"I hope that this matter does not affect that broader relationship but that is part of the reason we are establishing this inquiry," he said.

"To ensure that where those allegations and those fracture points have been aired, there is an independent forum to investigate them."

It is expected a report will be provided to the chief minister by the end of June 2023.

© AAP 2022

The number of people charged over a violent pitch invasion at Melbourne's A-League derby has grown to 13.

An additional 22 people have also been identified following public appeals with more charges expected to be laid in coming days.

More than 150 spectators stormed the AAMI Park clash between Melbourne Victory and Melbourne City on Saturday, injuring goalkeeper Tom Glover, referee Alex King, a TV cameraman and two security guards.

All four men allegedly responsible for those attacks have been charged or identified.

By Wednesday morning, ten more people had been charged.

They include two men aged 23 and 26, charged with violent disorder, criminal damage, unlawful assault and a string of other offences.

A 17-year-old boy was charged on summons with reckless conduct endangering serious injury and discharging a lit distress signal, over an incident that saw a cameraman hit by a flare.

Five other men aged in their twenties and an 18-year-old were charged with entry to competition space, riotous behaviour, disrupting a match and public nuisance, while another man in his twenties was charged with discharging a lit distress signal.

Investigators have released images of more men seen at the game they need to speak to.

About $150,000 worth of damage was caused to the venue and about 80 flares or fireworks were set off, according to police.

Poles and bottles were thrown at police on the field as they responded to the chaos.

Earlier, a 23-year-old Craigieburn man was charged after allegedly striking the goalkeeper in the head with a full bucket of sand.

An 18-year-old man from Alphington was charged over an alleged separate assault on the goalkeeper, while a 19-year-old man from Meadow Heights allegedly assaulted a security guard as well as the goalkeeper.

All those charged over the pitch invasion have been bailed and will appear at the Melbourne Magistrates' Court in February.

Premier Daniel Andrews on Monday warned the "cowardly" pitch invaders yet to hand themselves in would feel the full force of the law and soccer authorities.

© AAP 2022

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

Thousands of Queensland Police officers have been joined by members of the public and political leaders at a memorial service for two officers killed on duty.

Early-career constables Matthew Arnold, 26, and Rachel McCrow, 29, were shot dead on a property at Wieambilla, west of Brisbane, on December 12.

The Arnold and McCrow families paused for a moment at the two officer's coffins at the front of the service at the Brisbane Entertainment Centre on Wednesday morning.

Thousands of mourners packed into the building to attend the memorial along with Prime Minister Anthony Albanese, Opposition Leader Peter Dutton, Queensland Police Commissioner Katarina Carroll, Premier Annastacia Palaszczuk, state Opposition Leader David Crisafulli and Governor Jeannette Young.

Constable Keely Brough, who was with constables Arnold and McCrow when they were killed, fought back tears as she sat in the crowd of her colleagues in blue.

The ceremony is being 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 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.

Speaking ahead of the service, former police officer John O'Gorman said he was still in shock about the constables' deaths, which he heard on the radio while he was driving.

"I had to stop, I got very emotional I was extremely angry, still am, and ... the people who want to criticise the police for what they do, want to stop and have a look at what police do, they die protecting the community," he told 6News.

The shooters 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