A man has been arrested on suspicion of arson with intent to endanger life after a property fire.
The front door of the building in Wilton Street, Plymouth, was damaged by the fire on Thursday at about 16:25GMT.
Devon and Cornwall Police said the arrested man, who is in his 30s, had since been released on police bail.
Officers are appealing for information, including footage from dash-cams, CCTV cameras or camera doorbells.
