A man in his 50s has been arrested on suspicion of arson and criminal damage after a fire at a charity shop.
Police received a report of the fire at Action Cancer on Market Street in Bangor at about 04:00 (BST) on Friday.
A window had also been smashed on a door at another business close by.
The police said the blaze caused “substantial damage” to the shop.
The Northern Ireland Fire and Rescue Service sent four appliances to the scene but have since put out the blaze.
Police remain at the scene and are appealing for anyone with information to contact them.