A 24-year-old man needed hospital treatment after being attacked by a large group of men as he walked home from a night out in Wellingborough.
The man was in the area of Kiln Way and Queensway at about 5am on Saturday, May 16, when he was attacked.
A police spokesman said: “He was knocked to the ground by the men and seriously assaulted.
“The attack left him in need of hospital treatment.”
Witnesses, or anyone who knows anything about this incident, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555111 or use the anonymous online form at www.crimestoppers-uk.org.