Naveed Akram’s phone included videos showing him and his father standing in front of an Islamic State flag, making statements expressing extremist ideology and criticising “Zionists”.

The December attack allegedly targeted a Hanukkah celebration, with investigators claiming the gunmen displayed an Islamic State flag shortly beforehand.

The commission’s remit will cover the nature and prevalence of antisemitism in Australian society and institutions, the drivers of hatred and radicalisation, and the adequacy of government and agency responses before and after the attack.

Supporters of further reform point to data showing Australia now has more than 4 million civilian firearms, higher than estimates in 1996, even after decades of strict controls.

Two flags of the terror group Islamic State were recovered from the attackers’ vehicle. This categorically shows that it’s not a matter of individual pathology or social alienation; it is a clear manifestation of organised Islamist ideology translating into violence.

Tragically, they were shot and killed in the process. They were heroes too. They stepped forward in the face of extreme danger.”

As the Cauchi family so painfully articulated, providing support for a family member with mental illness is intensely challenging