Scores of firefighters raced to the scene of the blaze at the Northern Bar in Railway Street, Armagh, on Monday, March 4.
Inspector Gary Moore said: “A report was received at around 8am this morning of smoke coming from the Northern Bar.
“NIFRS personnel attended and extinguished the fire whilst police maintained a cordon in the area.
“Following an inspection of the premises we believe that entry had been gained to the bar sometime in the early hours of this morning and the bar then ransacked and set alight.
“We are also investigating an incident at Mullacreevie Park, where a white Audi A6 car was set alight shortly before 5 am this morning.
“We are currently working to establish if both incidents are linked.
“Our enquiries are at an early stage and I would appeal to anyone who noticed any suspicious activity in the Railway Street area, or at Mullacreevie Park, to contact officers in Armagh on 101 quoting reference number 182 04/03/19.
“Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.”