A man had his wallet stolen after he was attacked by two men and threatened with a knife in an underpass in Stony Stratford on Sunday.
Police are now appealing for witnesses to the incident which took place at 9.48pm as the 31-year-old was walking through the London Road underpass.
He was threatened by two men with a kitchen knife who stole his wallet and ran off towards the River Great Ouse.
The first man is white, in his late teens to early twenties, around 5ft 9ins, with short hair and slim wearing a flat peak baseball cap.
The second is mixed-race, in his late teens to early twenties, around 5ft 9ins tall, with dark hair and stocky. He was wearing knee length khaki shorts and a dark green or blue top.
Any witnesses can call police on 101 or Crimestoppers, on 0800 555 111.