Sgt. Maureen Hickey says a 14-year old girl approached a security guard and said she was swarmed by 10-15 youth 7200 and 137th street on Wendesday around 6pm.
The attack occurred only metres away from where hockey mom Julie Paskall was killed near the Newton Recreation Centre last year.
Police say security patrols and other safety protocols have been stepped up in the area since that brutal attack.
The victim was taken to hospital with minor head injuries.
Police have no suspect and say the investigation is ongoing.