A woman has suffered a broken jaw after she was punched during an argument with a group of three men in Bridge Street, Northampton.
The assault happened shortly after 4am when the woman was walking along Bridge Street with a group of friends.
An argument broke out between the group and two or three men. The woman was punched in the face and suffered a broken jaw.
Officers are appealing for anyone who was in Bridge Street around that time and who may have witnessed the argument or the assault to contact them.
A man was arrested in connection with the incident and has been released on police bail pending further inquiries.
Witnesses or anyone with information are asked to contact Northamptonshire Police on 101. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.