Police are appealing for witnesses to the assault, which happened on Saturday, July 22.

They say it happened sometime between 11.50pm and 12am, when an altercation occurred between two groups of males in New Conduit Street.

This has resulted in one man, aged in his 20s, being knocked unconscious. He was taken to the Queen Elizabeth Hospital for treatment.

Three males, aged 14, 20 and 21, were arrested in connection with the incident, but have subsequently been released under investigation whilst the enquiry continues.

Officers are keen to hear from anyone who was in the area at the time and may have witnessed the assault.

Anyone with information should contact PC Stuart Lacy at King's Lynn Police Station on 101.