We have sent two ambulances, a rapid response vehicle, our hazardous area response team and Hertfordshire Air Ambulance to the scene of a several vehicle collision between junctions nine and eight of the M11 northbound.
Police have closed the motorway in order to allow the air ambulance to land.
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Omid Saidy, 20, was knifed to death after asking a drug dealer and another man to leave the area, police say.