A man has been stabbed in a street fight involving around 20 people in Great Yarmouth.
The incident happened at around 4.30pm on Wednesday afternoon near King Street.
The man was taken to hospital but his injuries are not thought to be life-threatening.
Three men and a woman have been arrested on suspicion of affray.
The road was sealed off while officers dealt with the incident, but the cordon has since been partially lifted.
Officers believe that those involved knew each other.
"We received a number of calls from members of the public about this incident and several units were deployed to the scene," Great Yarmouth Policing Commander, Superintendent Roger Wiltshire, said.
"While enquiries remain in the early stages, the initial indications are that those involved are known to one another and detectives are continuing to investigate the circumstances surrounding the incident.”