Police are appealing for witnesses after three teenagers were robbed and a 15-year-old boy was taken to hospital with head injuries.
At around 9pm on May 4, two teenage boys, aged 15 and 16, and a 16-year-old girl, were in Shoreham Street, near Bramall Lane, when they were approached by a group of Asian teenagers.
The group allegedly threatened the teens with violence, demanding money.
The 15-year-old boy was then reportedly assaulted by the group and left with head injuries that needed hospital treatment.
If you have information about the incident, call 101 quoting incident number 358 of 5 May 2015, or call Crimestoppers anonymously on 0800 555 111.