Authorities in Victoria are investigating an arson attack on a defence company that occurred last year as an alleged terrorist incident, according to multiple Australian news outlets. The reports say the incident is being treated under counter-terrorism frameworks rather than as a routine criminal or industrial fire case. The attack reportedly involved deliberately set fire at the defence company premises in Victoria. Investigators are pursuing the investigation through the lens of terrorism, indicating they consider there may be wider motives or links beyond ordinary arson. Details about the company involved, the extent of damage, and whether anyone has been charged are not provided in the summaries from the sources. The Age, the Sydney Morning Herald, and the Brisbane Times all describe the matter in the same terms: the fire is under investigation and is being assessed as a possible terrorist act. Further information about suspects, findings, or next steps is not included in the provided excerpts.