A man was arrested and released under investigation in connection with an offence of grievous bodily harm in Lynn on Saturday.
Police sealed off the entrance to a property in Saturday Market Place after they were called to the incident.
A police spokesman said the victim was found in a telephone kiosk outside Debenhams.
“King’s Lynn CID are currently investigating a crime of grievous bodily harm,” he added.
“One male has been arrested and released under investigation regarding this. Enquiries are ongoing.”