Police are appealing for witnesses after a driver allegedly threw a cup of hot coffee over another motorist during an altercation on the A1(M) near Hitchin.

The incident happened just after the junction 9 southbound slip road at Letchworth at around 1.55pm on Wednesday, August 12.

Hertfordshire Constabulary says the driver of an Audi A6 reportedly undertook a Kia Picanto before suddenly braking, causing the Kia to stop in a live lane of the motorway.

The Audi driver is then alleged to have thrown a cup of hot coffee over the driver of the Kia before leaving the scene.

Police have described the suspect as a tanned man, aged approximately 50, who was small in height and had large glasses and a moustache.

Officers are now keen to hear from anyone who witnessed the incident or saw either of the vehicles being driven in the moments beforehand.

Anyone with information is asked to contact PC Harriet Webb at [email protected].

Information can also be reported through the Hertfordshire Constabulary website or by calling the non-emergency number 101, quoting crime reference 41/77042/26.

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Alternatively, information can be given anonymously to the independent charity Crimestoppers on 0800 555 111.