A 14-year-old boy was threatened with a knife before having his mobile phone stolen in Blakelands.
Police are now appealing for witnesses to the attack which saw him approached by three men as he walked on the industrial estate at 5.15pm on Wednesday.
One of the men spoke to him and asked what he had on him to which he told them he had an old phone. He was then told to hand over the phone or they would hurt him before one produced a kitchen knife and he gave it to them.
All three offenders were white men. The first was about 17-years-old, 5ft 9ins, slim build with broad shoulders, slim face with a thin nose and large nostrils. He was wearing a grey hooded jacket with the hood up and nude coloured tights over his face. He had a small kitchen knife with a 10cm blade and brown wooden handle.
The second man was on a black mountain bike which had a tall frame. He was about 17-years-old, 5ft 9ins and of a skinny build. He was wearing a grey hooded jacket with the hood up and white material covering the lower part of his face.
There is no description of the third man.
Any witnesses can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.