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Eight vehicles crash on motorway Eight vehicles crash on motorway
(20 minutes later)
At least two people have been seriously injured in a crash involving a coach and seven other vehicles on the M1. Three people have been seriously injured in a crash involving a coach and seven other vehicles on the M1.
The accident happened north of junction four just before 0430 BST, Hertfordshire police said.The accident happened north of junction four just before 0430 BST, Hertfordshire police said.
Ambulance crews attending the scene said one person suffered serious head injuries while 15 walking wounded were taken to a Watford hospital.Ambulance crews attending the scene said one person suffered serious head injuries while 15 walking wounded were taken to a Watford hospital.
The road is closed northbound between junction one and five, between the A406 North Circular Road and Watford.The road is closed northbound between junction one and five, between the A406 North Circular Road and Watford.
The entry slips are also closed northbound at junctions two and four.The entry slips are also closed northbound at junctions two and four.
A BBC 94.9 radio reporter at the scene said two people in the coach had to cut free.
All injured people have been taken to hospital.
A spokeswoman for Hertfordshire police said the motorway may remain closed for "a considerable time".