A derelict property in Newry was deliberately set on fire on Tuesday night.
Firefighters were called to the blaze on the Armagh Road shortly after 11pm.
Two crews from Newry, one from Portadown and another two from Warrenpoint attended the scene at 11.15pm.
A NI Fire and Rescue Service spokesperson said: “Firefighters were called to a fire at a derelict building yesterday evening.
“Firefighters used four jets, two hose reels and an aerial appliance to extinguish the fire.
“The incident was dealt with by 2.25am and the cause of the fire is being treated as deliberate at this time.”