A man has been hospitalised following an assault in Maidenhead Street during the early hours of Sunday morning.
The victim and a group of people left Popworld in nearby Bull Plain at around 3am, following which an altercation took place.
The victim, a man in his 20s, was punched in the side of the head and fell to the ground, losing consciousness.
An ambulance attended the incident and the victim was taken to hospital. He sustained a bleed on the brain and his injuries are still being assessed, although they are not believed to be life threatening.
Any witnesses who have not yet spoken to police are asked to contact Hertfordshire Constabulary on the non-emergency number 101, quoting crime reference 41/20231/19.
A 26-year-old man from Hertford has been arrested on suspicion of assault and has been released on police bail while investigations continue.
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