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Police need to find good samaritans who helped a boy who was attacked.
The teenager suffered head injuries during a disturbance involving a group of young people in Dover.
A Kent Police spokesman said: "Police are keen to talk to the good samaritans that stopped to help the boy at the scene."
They also want to heard from and anyone else who saw the assault and has information that could help in the investigation.
The disturbance happened at around 9pm on Friday, May 4.
Anyone with information is asked to call Kent Police on 01843 222289 quoting ZY/24062/18.
Alternatively, contact Kent Crimestoppers anonymously on 0800 555111.