National Highways says all lanes have fully reopened and it thanked drivers for their patience.

Emergency services are responding to the incident.

Athena fled owners' car after M1 crash but was lured out with a sausage roll following major search.

National Highways says delays are easing on the northbound carriageway.

Athena the German Shepherd fled her owners' car after they were involved in a crash on the M1.

The M1 fully reopens after a fatal crash on Sunday morning, which led to an appeal for witnesses.

National Highways say the works are nearing completion and the 50mph restrictions will be lifted.

Hertfordshire Police say they are trying to establish the cause of death.