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9 June 2014, 17:10 | Updated: 10 June 2014, 09:43
Cambridgeshire Police officers are looking for a black BMW after it was involved in a collision with a police motorbike on the M11.
The collision happened at about 4pm on the London-bound carriageway junctions 11-10.
The driver failed to stop at the scene and enquiries are ongoing to trace the vehicle.
The officer suffered serious but not life-threatening injuries in the incident. He is being treated by paramedics at the scene.
Anyone with any information should call police on 101.