Seven vehicles were involved in a major crash on a motorway this morning, police have said.

Two cars involved had also caught fire, Hertfordshire Constabulary said.

The force says it was called at 8.07am this morning to a multi-vehicle road traffic collision on the M1 southbound at Watford.

Seven vehicles were reported to be involved, police said.

Officers, the fire service and East of England Ambulance Service attended.

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The fire service put out two car fires, police said.

Watford Observer:

Watford Observer:

Minor injuries were reported.

The road was closed in both directions while emergency services worked at the scene.

The northbound carriageway was re-opened around 8.40am.

The southbound carriageway remains closed and motorists are advised to avoid the area.