Detective Constable Chris Hemm said: “This was a violent, unprovoked assault and we are carrying out extensive enquiries in the area.
“I would ask anyone who was in the park at the time or who lives nearby and has private CCTV, doorbell or dash cam footage to contact us as soon as possible.”
Police Scotland can be contacted via 101 quoting incident number 3815 of June 19.
Alternatively, an anonymous report can be made to Crimestoppers on 0800 555 111.
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