In the early hours of July 5 last year, a group of masked people allegedly broke into a defence manufacturer in Melbourne’s north-east. 

Three cars were set alight. The building was vandalised, and later, a video message appeared online with a masked man claiming responsibility; warning workers involved in the weapons supply chain that they were being watched. 

Waleed Aly has a PhD in global terrorism and says the message left behind is crucial to understanding what happened and what might happen next. 

Today, Waleed Aly on what makes political violence terrorism, and whether this attack is a sign of something much bigger taking hold. 

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Guest: Monash University terrorism expert Waleed Aly

Photo: Supplied: AFP