Detectives investigating a knifepoint robbery in Bradford have released an e-fit image of a man they want to identify.
The victim, a 13-year-old boy, was walking along Reevy Avenue at around 5.15pm last Friday when someone walking behind him attracted his attention.
A police spokesman said: "When the boy went over he was grabbed by the male, who produced a knife and told the victim to hand over his mobile phone.
"The victim handed over his phone and the suspect ran off towards Wibsey Park."
The spokesman said the boy had not been hurt during the robbery.
The robber is described as being a black male, around 5ft 6in and slim.
He was wearing a black hooded top, a brown bomber jacket, black jeans and glasses.
Anyone who recognises the person pictured or who may be able to help the investigation is asked to contact Bradford District CID on 101, quoting crime reference 13180043316.