A police probe is underway into an attempted robbery at a play area in Sheffield.
South Yorkshire Police said two teenagers were approached by a group of males, who got out of a car - possibly an Audi - and demanded that they hand over their phones.
The teens refused and one of the robbers, who was armed with a piece of wood or a bar, struck out at the victims.
One of the teenagers suffered a cut to his head.
Anyone with information about the incident at 10pm last night should call South Yorkshire Police on 101 or Crimestoppers on 0800 555111.