Officers were called following a robbery which took place on South Street in Sebastopol at approximately 3.30pm on Wednesday 3rd January 2018.
A male offender approached the male victim armed with a small knife. The victim was not injured during the incident however a mobile phone and rucksack was stolen.
Officers are investigating.
If anyone witnessed the robbery or has any information please call 101 quoting log 268 3/1/18 or contact Crimestoppers anonymously on 0800 555 111.