Bedfordshire Police were called around 10.30pm on Thursday, July 15, to a report of a stabbing in St Neots Road, Sandy.
A man in his twenties sustained serious injuries, and was taken to hospital for treatment.
A 19-year-old man from Sandy was arrested on suspicion of attempted murder, and has been bailed pending further enquiries.
Anyone with information about this incident is asked to contact the police by visiting the online reporting centre at https://www.bedfordshire.police.uk/report or by calling 101 and quoting reference number 468 of 15 July.