Police are investigating the cause of a suspicious fire in the early hours of Friday morning which substantially damaged a Devonport unit.
Firefighters responded to the blaze at 2.17 am and on arrival found the vacant Nicholls Street unit fully involved in fire.
However, the blaze was brought under control relatively quickly with some assistance provided by nearby residents.
A subsequent fire investigation determined the cause of the fire to be suspicious.
Police are asking anyone with information which may assist in the investigation to contact Devonport CIB on 131 444, or anonymously through Crimestoppers on 1800 333 000 or on-line at crimestopperstas.com.au