Firefighters have extinguished a fire in an unoccupied unit on Cygnet Crescent in Red Hill.
ACT Fire & Rescue received several Emergency Triple Zero (000) calls from 9pm.
On arrival, firefighters found the unit well alight but contained the fire quickly. A search of the building confirmed no one was inside the unit.
Three pumpers, two commanders, the Hazardous Materials Unit and Breathing Apparatus Van responded to the incident.
Crews are now undertaking ventilation operations.
The fire has been deemed suspicious and will be handed to ACT Policing.
The ACT Ambulance Service also attended the fire. No injuries reported.