A member of the public had his jaw broken when he intervened in an incident in Corby.
The incident happened between 3.30am and 5am on Sunday, February 26, when an altercation took place outside the Kwik Fit building in Lloyds Road.
As a result, one man was knocked unconscious.
A member of the public intervened and he had his jaw broken by the same offender, who is described as black and in his late 20s, about 6ft and muscular.
Anyone with information can contact police on 101 or Crimestoppers anonymously on 0800 555111.