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- -The M25 has been blocked near Watford following an incident.
- -National Highways says the motorway is shut between Junctions 21 and 20 as the Essex and Herts Air Ambulance Trust respond to an incident.
- -Google maps shows long queues forming in both the clockwise and anti-clockwise directions.
- -Motorists are urged to avoid the area if possible and find an alternative route
- -Follow our live blog for updates
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