Witnesses are being sought after a man was robbed in Great Park Street, Wellingborough.
The incident happened on Saturday May 8, between 4.15pm and 4.45pm, when a man was approached by another man who asked to borrow his mobile phone.
A spokesman for Northants Police said: "A short while later, the victim asked for his mobile phone back at which the suspect refused and showed the victim a knife which was located in his waistband.
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"It is then believed the suspect took the route pictured and spoke to two women outside the newsagent in Great Park Street, asking them for a cigarette, before he made off.
"The suspect is described as a white man, of slim build, about 25 years old, 5ft 11in, with dirty blond hair and beard, a long face and a small nose.
"He had a local Wellingborough accent and was wearing a black hoody with the hood up and a grey jumper over the top.
"!The hoody had a black shiny stripe and Nike logo.
"He also wore baggy black tracksuit trousers with white stitching on the leg and dirty white Nike Air Force trainers."
Witnesses, anyone with information, or anyone who may have been offered the phone for sale, should call Northamptonshire Police on 101 quoting incident number: 21000252992.
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