An IPOD, mobile phone and a bag were robbed from a 17-year-old male as he walked along the Greenway in Ripley Last Thursday.
A group of three older teens wearing hooded tops and balaclavas and riding bikes attacked the youth from behind at around 6.30pm.
A gang member pushed the teen to the floor before the three took the items. All were described as being in their late teens.
One male was white with blond hair, wearing a black jacket, white polo shirt and riding a blue bike. The second male was described as around 5ft 6 inches, slim, wearing black hooded top and a green balaclava covering the mouth.
The third male was also 5ft 6 inches, wearing similar clothing, but with a noticeably spotty complexion. Police are looking to trace witnesses to the incident. If you have any information contact police on 0345 123 33 33.