A man was taken to hospital after being stabbed in the stomach in Market Street, Wellingborough.
Police were called at about 4am on Sunday following reports of an incident outside Rafferty’s pub.
A 35-year-old man suffered a stab wound to the stomach and was taken to Northampton General Hospital for treatment.
A 49-year-old man was arrested in connection with the incident and has been released on bail pending further enquiries.
Witnesses, or anyone with information about the attack, is asked to call Northamptonshire Police on 101 or they can call the independent charity Crimestoppers anonymously on 0800 555111 or use the anonymous online form at www.crimestoppers-uk.org.