The Northern Ireland Fire and Rescue Service (NIFRS) have confirmed that their investigation into the cause of the Belfast Primark fire is due to begin.
It comes as firefighting operations at the historic Castle Street bank buildings are scaled back to one fire appliance.
The existing safety cordon remains in place and fourteen nearby business remain closed.
There were fears that the building could be at risk of further damage after structural collapse overnight.
It was ravaged in the fire that began on Tuesday morning and quickly spread throughout the building, causing the roof and floors to collapse.
All staff and customers at the premises were quickly evacuated and nobody was hurt.
The future of the building and staff remains unclear, with union Usdaw confirming that the estimated 350 staff would be paid for this week.
Belfast City Council is continuing to work with businesses' affected by the fire and Lord Mayor Deidre Hargey has said that the city centre will get back to normal as soon as possible.
Kelly's Cellars - Belfast's oldest traditional Irish pub - which is situated to the rear of the Primark premises was able to reopen on Thursday.
A NIFRS spokesperson confirmed that while the incident was still ongoing, the operation was being scaled back.
“NIFRS Fire Investigation Officers will now begin conducting their investigation to determine the cause of the fire," the spokesperson said.
“We commend Fire Crews for their tremendous efforts during this challenging incident, the valuable assistance provided by our partner agencies and the support from the public during this time.”
Belfast Telegraph Digital