South Africa is the regional centre of an intricate trafficking network that recruits women and children from Mozambique, Angola, Malawi, Thailand, China, Eastern Europe and even as far afield as the East Asian city of Macau, according to the Geneva-based International Organisation for Migration (IOM). Trafficking in the region is conducted by four broad groups - organised crime, businesswomen, sex tourists and refugees, said IOM's Jonathan Martens in his presentation to a conference in Johannesburg, South Africa.