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A 54-year-old man has been arrested in connection with a fire in Dover.
The fire is believed to be the same that began at an outbuilding, before spreading to a three-storey building in George Street containing flats.
There were no reported injuries, but the roof of the residential building was damaged.
A police spokesman said: "Police officers were called to the scene in Erith Street at 9.14pm yesterday, where an outside storage area had been deliberately set alight."
A man from Dover was arrested at the scene on suspicion of arson.
He remains in custody while enquiries are ongoing.
Anyone with information about the fire, who has not already spoken to officers, is asked to phone Kent Police on 01843 222289 quoting 15-1531.
Alternatively, contact Crimestoppers, anonymously, on 0800 555111.