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- The M1 is closed in Hertfordshire this evening (Saturday April 4) following reports of a crash.
- The northbound carriageway is shut between Hemel Hempstead and Dunstable.
- Emergency services are at the scene.
- There are delays of up to 10 minutes and one mile of congestion on the approach to the incident.
- This is a developing story and will be updated with the latest information as and when it becomes available.
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