Police are investigating an assault which has left a 19-year-old man in hospital with a serious head injury.

It happened just before 1.40am on Saturday morning, at the junction of Windsor Drive and Cranleigh Court Road, Yate.

The man was walking home with friends after a night out when they became involved in an altercation with another group.

Police say the victim suffered a head injury and went home, where he collapsed and an ambulance was called.

House-to-house and forensic inquiries have been carried out and uniformed neighbourhood officers patrolled the area following the assault.

Three men aged 32, 24 and 20 were arrested on Saturday on suspicion of wounding with intent.

All were later released on police bail with conditions including an overnight curfew.

The investigation continues and if you saw the incident or have CCTV or dashcam footage which could help, call 101 quoting reference 5220177893.

Alternatively ring the independent charity Crimestoppers 100 per cent anonymously on 0800 555 111. They never ask your name or trace your call.