Core isn't just Bosnians - it's mostly Greeks but with Bosnians, Italians, Turks, Albanians, Aussies. Whereas City it's more South American, Islander, Maltese, Serb, Polish, Maco etc.It's because the core are Bosnians. They even have banners in Bosnian on the terraces. "Kilometre Gazimo, Pobjede Slavimo"