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- Hertfordshire Constabulary said they were "dealing with an incident" on the A405 North Orbital Road, just south of junction 6 of the M1.
- Motorists were advised to avoid the area.
- Hertfordshire County Council reported there was a crash heading south after the M1 junction.
- The road was closed immediately off the M1.
- People have reported seeing sniffer dogs and a police helicopter near the scene.
- Police have been contacted for more information on the incident.
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