Three men were knifed during a fight in Mitcham on Friday, March 16.
Police are appealing for witnesses to the incident, which involved three black men in London Road at around 1pm.
All three men sustained injuries which were not serious and were later released from hospital.
One youth was arrested but was released without charge.
London Ambulance Service treated a 15-year-old boy at the scene and he was taken to hospital by paramedics.
Anyone with information should call Wimbledon CID on 020 8649 3147 or Crimestoppers anonymously on 0800 555 111.
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