Four people were injured in a “violent and completely unprovoked attack’ on New Year’s Day in Peterborough.
Police have now released CCTV images of five people they would like to speak to following the assault.
The incident happened at about 1.30am on Sunday 1 January outside a taxi rank in Westgate, Peterborough, when four people were approached by five others who attacked them.
All four victims, two men and two women, were taken to hospital to be treated for injuries to their heads and faces.
Detective Constable Lloyd Davis said: “This appears to be a violent and completely unprovoked attack which left the victims with serious facial injuries.
“We are urging anyone who recognises the people pictured, or who saw the incident take place, to get in touch with us as soon as possible.”
Anyone who recognises those pictured is asked to contact police as soon as possible using the online webchat function or by calling 101 quoting reference number 35/67/23.