Crews called to fire at Bicester Village
Seven fire engines and around 35 firefighters were on scene to deal with the incident, which started at around 8.30am today.
An aerial platform ladder was used to tackle the fire, which had spread to the roof of the building.
Firefighters are currently damping down at the scene and monitoring adjacent buildings.
No injuries have been reported.
Crews are liaising closely with the Bicester Village management and Thames Valley Police.
The cause of the fire is yet to be determined.