Police were called at 11.51pm on Monday, 27 March to reports of a collision involving two cars and an HGV between Junction 14 and 15 (Heathrow).
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Officers, the London Ambulance Service and the Helicopter Emergency Medical Service attended the scene. The driver of one of the cars involved, a man – no further details – remains in hospital in a life-threatening condition. Next of kin have been informed.