An eye witness, Sophie Burnett said:
"The fire began around 12 o'clock, they began by shutting the shops closest like Boots and M&S, they then evacuated the whole of North Terminal Landside and have stopped all publicly transport coming over to the terminal including the shuttle and the public bus services.
"They're currently trying to isolate the smoke from the building."
More top news
James Wright has Monday's forecast for the east of the region.
James Wright has Monday's forecast for the west of the region.
For the second time this month, the region has been hit with heavy snow - leading to disruption and a number of events being cancelled.