A fire broke out at the Primark building in Belfast city centre. The Northern Ireland Fire and Rescue Service (NIFRS) received a report at 11:00 BST that the top floor of the five-storey commercial building was on fire.
A number of fire engines are at the scene and it is believed the fire has spread to the ground floor.
No reports of any injuries and the building has been evacuated. NIFRS have advised people to avoid Castle Street and Royal Avenue while the incident is ongoing.
The clothing giant confirmed in a tweet that all staff members were safely evacuated.
Royal Avenue has been cordoned off and pieces of debris fell from the side of the historic building.
The clothing and homeware chain is currently undergoing a major refurbishment. It is being extended along Castle Street in a project costing an estimated £30m.
The Bank Buildings were designed by Sir Robert Taylor and erected by Waddell Cunningham in 1785.