Police in Gloucester are appealing for information following a robbery in Tredworth on Friday.
A 19-year-old Gloucester man was walking along the ash path between Tredworth Road and White City at about 3.30pm when he was approached by a man who asked him for money.
When the victim said he didn't have any the robber waved a knife in front of him and demanded money. The victim handed over £90 in cash before the offender walked off.
Anyone with information is urged to call 101, quoting incident 351 of January 5.
Alternatively information can also be given anonymously on 0800 555 111, or via www.crimestoppers-uk.org. In some cases Crimestoppers offer rewards of up to £1000 where information leads to a conviction.