Preliminary multi-agency investigation into the cause of the Union Street fire in Glasgow is underway

However, the Scottish Fire and Rescue Service (SFRS) cannot at this early stage speculate on what happened.

More than 200 firefighters in total have been involved in the effort to make the area safe since the alarm was raised at 3.46pm on Sunday 8 March.

As of the morning of Monday 9 March, eight fire appliances and three high reach vehicles remain at the scene.

At the height of the incident, 18 fire appliances and specialist resources, including a high-volume pump drawing water from the River Clyde, were deployed to the scene.

There are no reported casualties, either members of the public or SFRS staff, however the fire has caused extensive damage to the building and the loss of the building's dome.

Crews are working to cool off hotspots within the stonework and assist structural engineers in assessing the stability of the remaining building.

A Scottish Fire and Rescue Service spokesperson said: "This has been a significant incident in Glasgow city centre, which has involved hundreds of firefighters working tirelessly since yesterday afternoon.

"We have now scaled back and eight appliances, including three high-reach vehicles, remain in attendance.

"The initial response involved crews from Glasgow and Lanarkshire, however any incident on this level would need to draw on resources from across Scotland as we bring in relief crews to take over.

"We cannot speculate on the cause of the fire at this time. In line with fire investigation protocols, a multi-agency investigation will be conducted, however due to the significant damage that has occurred this may be hampered."

Members of the public are still advised to avoid the area where possible, and nearby residents should keep windows closed as a precaution.

Due to the proximity of the incident to the railway infrastructure and the presence of significant debris, Glasgow Central Station remains closed.