The youths had gathered at the shopping centre in connection with the celebration of the Islamic holiday of Eid al-Adha.
But several of those present got out of hand, according to police. Bicycles were thrown onto the nearby S-train tracks, shoppers at the mall were harassed and rocks were thrown at police who arrived on the scene.
Officers managed to split the group in two and drive them away from the mall. Five youths were eventually arrested as a result of the fracas.