More than one million people believed to be held in Xinjiang detainment camps Detainees are from minorities mostly including Muslim Uyghur people Allegations of rape, torture and forced sterilisation of female detainees Refugee Tursunay Ziawudun says she was gang-raped three times Australian Foreign Minister Marise Payne says reports 'deeply disturbing' Uyghurs also alleged to work in forced labour camps for major global brands