A teenage girl was hospitalised after being attacked in a park.
The 14-year-old was at Southgate Skate Park in Southgate Avenue, Crawley, when she was assaulted at around 7pm on Wednesday.
She was taken to hospital but has since been discharged.
Sussex Police launched an investigation and two 15-year-old girls and a 13-year-old girl from Crawley were arrested on suspicion of assault.
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They have been released on bail pending further enquiries.
A spokesman for Sussex Police said: "Witnesses or anyone with mobile phone footage or information is urged to contact Sussex Police online or call 101 quoting serial 1137 of 17/04.
"Anyone who has video footage of the incident is asked to not share it on social media, and to share it with police."
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