A red bus is reportedly on fire on the M1.

Motorists driving southbound, towards Junction 5 (Watford) have reported seeing the backend of the vehicle ablaze.

Drivers are said to be trying to avoid the fire.

Fire crews and police are in attendance and ambulance crews are said to be aware of the incident.

Police representatives have said they do not believe anyone is on the bus, which is currently on the hardshoulder.

More to follow.