# Crime and extremism investigations in Australia

> Live situation record from CLSTR: https://clstr.news/situations/crime-and-extremism-investigations-in-australia
> Updated: 2026-09-23T01:46:39.000Z. Sources: 20. Developments: 2.

Australian authorities have addressed various violent crimes and extremist activities across several states. 

In Sydney, two teenagers were charged in connection with the mistaken-identity shooting of university student Marco Tapia, an incident linked to organized crime. This investigation involved the extradition of individuals from Melbourne to New South Wales regarding firearms used in multiple shootings. In Brisbane, legal proceedings were initiated following a vehicle crash into a synagogue gate and the arrest of an 18-year-old facing charges for possessing violent extremist material and child abuse content.

In Melbourne, law enforcement arrested a 65-year-old man accused of acting as an Islamic State operative and propagandist. Following a years-long investigation, the Australian Federal Police allege the individual, an Australian citizen, distributed approximately 10,000 files via an encrypted messaging app between 2015 and 2020. The material reportedly included videos and images of executions, torture, and other violent extremist content, as well as instructional guides on conducting mass-casualty attacks and methods for evading law enforcement detection.

The investigation was reportedly triggered in 2020 when border officials discovered suspicious material on the man’s electronic devices as he prepared to travel to Egypt. Acting Assistant Commissioner Paula Hudson described the individual as a “principal distributor of ISIS propaganda,” noting that the content was specifically designed to radicalize others. The man faces multiple charges, including membership in a terrorist organization and the transmission of violent extremist material. He also faces charges for using a carriage service to cause offense, with a maximum potential penalty of 10 years in prison.

## Claims

- A 65-year-old man in Melbourne is accused of being a principal distributor of Islamic State propaganda. (corroborated by 11 sources)
- The accused allegedly shared approximately 10,000 files containing extremist content between 2015 and 2020. (corroborated by 11 sources)
- The shared material included instructional guides on planning mass casualty attacks and avoiding law enforcement detection. (corroborated by 11 sources)
- The investigation began in 2020 after border officials found suspicious material on the man's devices during a trip to Egypt. (corroborated by 11 sources)
- The 65-year-old man faces charges including membership of a terrorist organization and transmitting violent extremist material. (corroborated by 11 sources)
- The maximum penalty for the offenses is 10 years in prison. (corroborated by 11 sources)
- The man was arrested at his home in Carlton, Melbourne. (corroborated by 11 sources)
- The accused allegedly used an encrypted messaging app to distribute the material. (corroborated by 11 sources)

## Timeline

### 2026-09-23: Melbourne man accused of distributing 10,000 Islamic State propaganda files

A 65-year-old Melbourne man faces terrorism charges for allegedly distributing 10,000 Islamic State propaganda files and mass-casualty attack guides via encrypted messaging apps.

13 sources. https://clstr.news/cluster/australian-federal-police-arrest-accused-islamic-state-operative-in-melbourne

### 2026-09-16: Australia police report multiple violent crimes and extremist charges

Australian authorities have charged several individuals in connection with various violent crimes, including a mistaken-identity murder in Sydney, extremist social media activity, and a synagogue ramming.

9 sources. https://clstr.news/cluster/two-teenagers-charged-with-murder-in-sydney-mistaken-identity-shooting

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Cite as: Crime and extremism investigations in Australia. CLSTR, https://clstr.news/situations/crime-and-extremism-investigations-in-australia