Northumberland Fire and Rescue Service crews were called to The Black Bull in Middle Street, Corbridge, on Saturday, December 11.
In a statement, a spokesperson said: “Four appliances were in attendance and the fire has now been extinguished.
"Fire investigators are now at the scene to carry out a full investigation into the cause of the fire.”
Middle Street is expected to remain closed to vehicles until around 5pm on Saturday, the service added.
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Northumberland Fire and Rescue Service were called to the incident in Corbridge on Saturday, December 11.