A MAN is fighting for his life following a serious incident on the M3 motorway.

A 21-year-old man from Winchester has been left with potentially life-threatening injuries following a serious incident at around 4pm on Saturday.

He was hit by a vehicle near to the Northbound slip-road at Junction 11 and rushed to hospital.

According to police, he had attacked a 59-year-old man from Southampton on the carriageway.

His alleged victim was left with serious but not life-threatening injuries and has since been discharged from hospital.

The motorway was closed for several hours to allow officers to investigate the circumstances of the incident and was subsequently re-opened at around 11.30pm.

Officers now want to speak to witnesses to help with their investigations.

A police spokesperson said: "Were you on the M3 at the time? Perhaps you have dash-cam footage of the assault or of the vehicle prior to the collision?

"Anyone with information is asked to phone 101, quoting reference 44200441727.

"Alternatively you can contact independent charity Crimestoppers anonymously on 0800 555 111.