A man was left unconscious after being horrifically assaulted by another man in Northampton.
The attack happened on May 29 at around 7.45pm after the victim exited a taxi on Balfour Road and was assaulted from behind by another man.
The victim was knocked unconscious and he suffered facial injuries as a result.
Police officers have released CCTV images of two people they believe may be able to help them with their investigation into the attack.
A spokesperson for Northamptonshire Police said: "The two people in the images may be able to assist the investigation and them, or anyone who knows them, should contact Northamptonshire Police on 101.
"They were also believed to be in company with two other females, who are also encouraged to come forward."
Anyone with information about the attack is asked to call Northamptonshire Police on 101, quoting incident number: 21000310035.