Plumes of smoke can be seen billowing into the air over Bicester after reports of loud explosions near Bicester Heritage site.
Numerous reports from local residents on social media suggest a large emergency services presence at the scene. The exact nature of the incident is not yet known.
A local said on social media: "Just a heads up, folks: there's a massive fire currently ongoing at Bicester Heritage/Bicester Motion. Probably best to avoid that area, in order to let emergency services get through! Lots of smoke, small explosions and sirens right now.
"Hopefully nobody gets hurt!"
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