Swift action by Launceston Fire Brigade was able to limit the damage to a unit at Ravenswood on Saturday evening.
A fire, which has been deemed suspicious by Tasmania Police, caused a "limited" amount of damage to the property.
The unit was located on Lambert Street and was unoccupied at the time of the fire.
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The fire occurred about 9.15pm, with fire and smoke damage caused mainly to the unit's bathroom.
An investigation by Tasmania Fire Service and police has determined the fire was deliberately lit.
Tasmania Police is investigating the crime and encourage anyone who may have information to contact Crime Stoppers anonymously on 1800 333 000 or at crimestopperstas.com.au.
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