A tobacco shop in Norlane has been targeted twice in less than a week.
Police believe a car was rammed into the store on Donnybrook Road just after 1.30am Saturday, before being set alight.
Crews quickly put out the blaze and handed the scene to police.
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Detectives are now investigating whether the damage and blaze are linked to any other recent incidents.
The shop was damaged when a car was rammed into the store last Sunday morning.
Anyone with information is being urged to call Crime Stoppes on 1800 333 000.