Five units of Kilkenny Fire Service from Callan and the city were called out to deal with a blaze in the centre of Callan on Wednesday night.
Just before 9pm they were alerted to the fire in the old Coop building, on Green Street. The fire service brought the blaze under control but serious damage has been caused to the roof of the old building.
One elderly lady, who is 92, lives next door to the old Coop and had to be evacuated.
Some streets in the area were closed off for a time. The scene will be inspected on Thursday.
Thanks to John Stapleton for the video below - it shows the blaze in full force and the roof of the building falling in.
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.