A man was stabbed in the back during a fight outside KFC in Wellingborough.
Three men were involved in the fight opposite KFC in Cambridge Street at about 6.40pm on Monday, which left one of them with a stab wound to the back.
Both offenders were black, about 6ft and one wore a blue jacket with white sleeves.
The other wore a black bomber jacket and may have had dreadlocks.
A police spokesman said the victim was taken to hospital and his injury is not believed to be serious.
Witnesses or anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 555111.