Police said they could be motivated by the belief the business was part of the Australian Defence Force's supply chain. The act or threatened act must intend to intimidate the public, or coerce, or influence by intimidation, any government. The threat of far-left extremism was recently outlined by Australia's spy chief Mike Burgess. But Prof Peucker said far-left extremism had not been a major focus of authorities. "It would be probably the first (terror attack) on the far left that we have seen in many, many years."