A 41-year-old man was robbed of his bike after being threatened in the city on Sunday.
At around 1.10pm, the victim was unlocking his bike outside the Londis Shop in Downs Barn when a man approached him and held onto it.
The offender demanded his watch and mobile phone and implied that he had a knife in his pocket, although no weapon was seen.
The victim handed over his watch after being threatened before the offender ran along Downs Barn, Boulevard.
The offender is 5ft 11in, around 30-years-old. He was wearing dark clothing.
After the incident the victim discovered his watch was in his pocket.
Anyone with information should contact Det Con Wendy Cissell on 101.
If you don’t want to speak directly to the police you can contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org
No personal details are taken, information is not traced or recorded and you will not go to court.