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Two teenage boys were taken to hospital with head injuries after being attacked as a large crowd watched.
The boys, aged 15 and 17, were set upon outside a property in Terminus Drive, Herne Bay by suspects reportedly wielding weapons.
Police say there was a large group of people at the scene, and they now want to talk to witnesses.
PC Justine Cullen said: "During a disturbance at the address a 15-year-old boy and a 17-year-old boy, both from Herne Bay, received head injuries and were taken to hospital. The injuries are not reported to be life threatening.
"We are carrying out enquiries to establish the circumstances of the incident and would like to speak to witnesses who were there.
"We believe there was a large group of people at the scene when the reported assaults took place and are appealing for anyone with information to get in touch as soon as possible."
The attack happened between 9pm and 9.45pm last Friday.
Anyone with information is asked to call police on 01843 222289 or Crimestoppers anonymously on 0800 555111 quoting reference number ZY/060933/17.