Children in Wembley are being violently threatened and mugged on their way home from school by older teenagers, according to Brent Police.
A 13-year-old boy, who was kicked in the groin for his mobile phone, has already been operated on and has been left with life-changing injuries.
The helpless boy was approached by two black youths aged between 14 and 16 near Manhattan Chicken Shop in High Road, Wembley, last Thursday at 3.40pm.
They asked him what school he went to before eight other males joined the gang, kicked him to floor and mugged him.
DC Shahid Anwar, from Brent's Priority Crime Unit, said: "This was a cowardly and unprovoked attack on the victim which has left him with life-changing injuries. Police are making every effort to identify the suspects for this offence."
Another 13-year-old boy and his friend were walking along Harrow Road, Wembley, less than 15 minutes later and were threatened with a knife. The victims were forced to hand over their money by two thugs who were described as black, one with Afro hair.
A similar robbery took place near PFC Chicken shop in Harrow Road, Wembley, an hour later.
Two 11-year-old boys were on their way home from school and were approached by three black teenagers who demanded their phones and money.
After snatching their phones one of the suspects told the boys to move or they would be punched in the face.
Another yob then asked the boys to hand over their money. As the victims tried to find some cash the suspects ran off and boarded a number 18 bus.
Suspect one was wearing a black jacket, black school trousers, blue woollen beany style hat and black Nike trainers. Suspect two was wearing a black coat with the hood up, black school trousers, bright blue school tie and black trainers. Suspect three was wearing a brown woollen style beany hat, brown body warmers with pink stripes and black school trousers.
Anyone with information about either attacks should call DC Anwar at Wembley Police Station on 020 8733 3250 or Crimestoppers anonymously on 0800 555 111.