About 200 people were evacuated from the BMW Mini works in Cowley after a small fire broke out.
The blaze broke out in the filters of an air-conditioning unit on the top of a building at the car factory.
The fire and rescue service was called at 5.30pm on Friday and sent engines from Rewley Road, The Slade and Abingdon fire stations. They left the scene at 6.20pm.
BMW spokesman Wayne Morse said: “Once the all-clear was given, the work force in that area returned.”
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