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A section of the A509 from Milton Keynes towards Olney is closed this afternoon (5/3).
The stretch of the dual carriageway from the roundabout by Interchange Park, Newport Pagnell to Chicheley is currently affected.
The reason for the sudden road closure is unknown but drivers previously reported seeing fire engines rush through the area at around 15:00.
You can keep up to date with the road closure here.