It's since been revealed that his weapons licence was cancelled, and it is alleged he had obtained the firearm illegally.
Australia implemented some of the strictest gun laws in the world after the 1996 Port Arthur massacre, where 35 people were killed by a lone gunman.
While all states and territories agreed to a National Firearms Agreement, the laws on gun ownership differ from state to state.
Jump to your state or territory to see what gun laws are in force:
This is a hard no.
Currently, in Australia, it is an offence to own a lethal or non-lethal weapon for the purpose of self-defence.
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The states and territories differ on this answer but as a general consensus authorities expect a person to take reasonable precautions to prevent a firearm from being lost or stolen.
In most jurisdictions, it is considered an offence to not appropriately store a firearm.
If travelling interstate, it's expected that a person will check the regulations of the particular state or territory they are entering.
This is a yes, but probably no.
Each state and territory is different in terms of how easy it is to obtain certain types of firearms.
Firearms are split into categories which include A, B, C, D, E and H, with H typically being the most restrictive and including handguns.
Semi-automatic rifles over 10 rounds are typically restricted to government agencies and occupational shooters.
There is a ban on automatic and semi-automatic firearms under the National Firearms Agreement.
The order varies across states and territories but it effectively prevents a person from obtaining, possessing or using a firearm, or ammunition, in the interest of public safety.
The order allows police to search homes, cars and individuals without a warrant.
Queensland is currently the only jurisdiction without firearm prohibition laws.
A licence or permit is required to legally own a firearm in Queensland.
The process requires stringent background checks, a genuine reason for owning a gun (for example recreational shooting or hunting), and safety courses.
To be eligible a person must be:
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Non-compliance with the state’s weapons laws could see a maximum penalty of up to 13 years in prison and a hefty fine.
There are proposed laws before the state parliament to implement a prohibition order, which would prevent an individual from acquiring a firearm and allow police to conduct warrantless searches of individuals and their property to ensure they are complying.
Western Australia has just passed its toughest gun laws to date.
To obtain a licence, there are now eight categories that require stronger evidence of why a gun is needed.
It costs $396 to apply for a licence and $75 to renew.
There is a limit of 10 guns for most people, and even fewer for those obtaining firearms for hunting licences.
The licence renewal process also now includes a mental health and physical check.
The deaths of Jennifer Petelczyz and her 18-year-old daughter Gretl at the hands of shooter Mark James Bombara have prompted the government to consider further amendments to the state's gun laws.
The Northern Territory has the second-highest rate of gun ownership in Australia and some of the nation’s weakest controls.
In the NT the maximum penalty for unlawful possession of a firearm is one to two years in prison, compared with 14 years in NSW and up to 20 years in the ACT.
And unlike most other states, the NT has waved the 28-day waiting period to acquire a gun for people who already own one.
The daughter of Mark James Bombara, who shot and killed Jennifer and Gretl Petelczyc in their Floreat home, says police were warned about her father's disturbing behaviour.
An NT gun licence costs between $81 and $280.
Laws were passed in 2019 introducing a Firearm Prohibition Order, which increased maximum penalties for a range of firearms offences.
Critics said those laws left room for interpretation and were not ideal for recreational shooters.
To acquire a gun licence in the NT a person must:
South Australians must attend a police station with 100 points of ID to undergo a background check before acquiring a gun licence.
Any suspicious person’s fitness to possess a firearm can be reported to the Registrar of Firearms.
South Australia also has a public access register of people subjected to the state’s firearms prohibition order.
The state has a digital firearm licence available too.
Gun licences in South Australia cost between $110 and $565.
New South Wales is heavily regulated in terms of gun ownership.
The state’s police force is responsible for issuing licences and permits and is also in charge of conducting checks to ensure firearms are stored appropriately.
A person seeking to obtain a firearm must meet strict eligibility criteria similar to Queensland’s and the ACT.
A licence costs between $100 and $250, depending on its duration.
After the Lindt Café siege in 2014, then-premier Mike Baird changed the legislation to also include a new offence of possessing a stolen firearm, which increased the maximum penalty to 14 years in prison.
The NSW government also created an Illegal Firearms Investigation and Reward Scheme.
Gun laws in the ACT have given police extraordinary powers to regulate firearms.
Under the Firearms Act 1996, officers have the power to conduct on-the-spot searches as well as storage inspections, either with or without the consent of the licence holder.
The general cost in the ACT for a licence is around $166.
To obtain a licence in Tasmania, a person must not have committed a violent crime within the previous five years or be subject to a restraint order.
Like other states and territories, there must be a "genuine reason" to use a firearm, including:
On the eve of the 28th anniversary of the Port Arthur massacre in which Walter Mikac lost his wife and two daughters, the gun reform campaigner says it is "bittersweet" to finally see federal government funding for a national firearms register.
In addition to meeting the requirements for a firearm, a one-day safety course must also be completed.
For first firearm holders, a 28-day "cooling off period" is required before the permit is granted.
The penalty for possessing or using a firearm in breach of licensing conditions can be up to two years in jail.
Earlier this year, Tasmania’s major political parties vowed to overturn a rule that required antique gun owners to hold a firearms licence, which is yet to be tabled in parliament.
A gun licence in the state costs anywhere between $37 and $683, depending on the category and number of years it spans.
In Victoria, adults can apply for a gun licence but must have "a genuine reason" to need a gun.
There are several character tests that disqualify people from obtaining a licence, including criminal convictions and intervention orders.
Police can also refuse if there is a record of physical or mental illness, or drug or alcohol abuse where medical advice suggests a person should not own or use a firearm.
In Victoria, someone caught with an unregistered gun can be jailed for up to 17 years, depending on what type of weapon they have.
Carrying a loaded weapon in a public place is also banned and carries a jail term of 10 years.
The cost of a gun licence in Victoria ranges from $180 to $1,994.
Editor's note (3/07/2024): This article incorrectly stated that Western Australia's firearm reforms were prompted by the deaths of Jennifer Petelczyz and her 18-year-old daughter Gretl. WA's gun law reforms entered parliament in February 2024.
Posted Fri 21 Jun 2024 at 10:40pm Friday 21 Jun 2024 at 10:40pm Fri 21 Jun 2024 at 10:40pm , updated Wed 3 Jul 2024 at 3:51am Wednesday 3 Jul 2024 at 3:51am Wed 3 Jul 2024 at 3:51am