AFP announced that police detained the man after investigators linked him to extremist propaganda tied to the Islamic State group.
Authorities allege the suspect not only expressed loyalty to ISIS but also circulated material outlining how to organise large‑scale violent attacks.
The arrest follows heightened scrutiny of extremist networks in Australia, with law‑enforcement agencies emphasizing the threat posed by online radicalisation and the dissemination of tactical guidance.
Police have not disclosed further details about the evidence or any additional individuals under investigation, and the case remains under active investigation.