Police are appealing for witnesses after two men were injured when a fight spilled out onto the street.
Several people were assaulted in the incident outside The Mail House in Fenkle Street, Alnwick, just after 1am on Sunday.
Two men received serious injuries and had to have hospital treatment. They have since been discharged.
A third man was seen being repeatedly punched and kicked during the fight but he was not there when police arrived and hasn't reported the assault. Police would like him to get in touch so they can establish that he is all right.
Police said the incident involved a large group of people. Officers have been carrying out inquiries and reviewing CCTV footage of the incident.
A 23-year-old man has also been arrested and released on bail.
Police would like anyone else in the area at the time to get in touch. It was a busy time and a number of people would have been wearing fancy dress for Hallowe'en.
Anyone with any information about the fight, or anyone who could help the police investigation, should contact officers on 101 quoting reference 126 30/10/16 or Crimestoppers anonymously on 0800 555 111.