A 14-year-old boy was stabbed during a park fight involving a large number of youths.
Officers were called to Lloyd Park, at about 6.20pm last night and found the teenager suffering from a stab wound to the chest.
London Ambulance treated the boy at the scene, before taking him to a south London hospital where he remains in a stable condition.
His injuries are not believed to be life threatening or life changing.
Three people have been arrested in connection with the incident, which is being investigated by Croydon CID.
A police spokesman said: "One 20-year-old and two 15-year-old males have been arrested and remain in police custody."
Anyone with information should contact Croydon police on 0203 726 2172 or Crimestoppers anonymously on 0800 555 111
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