Police are investigating an incident of assault at Kie Skatepark, Whitehaven, that occurred on 4 October between 4pm and 6:30pm.
A 13-year-old was assaulted by a large group of youths, aged between 10-15 years old, he sustained no injuries.
A Cumbria Police spokesman said: “A member of the public intervened and assisted the teen.
“Officers are keen to speak to this individual to help with the investigation.”
Anyone with information is encouraged to contact PC 2467 on 101, quoting incident number 130 of 5 October. Alternatively you can call Crimestoppers, anonymously, on 0800 555 111.