Authorities in South Africa step up immigration enforcement amid heightened concern over undocumented migration and rising tensions, and a series of repatriations and voluntary returns are underway for foreign nationals. According to the report, hundreds of people from Nigeria, Ghana and Mozambique have left South Africa ahead of a planned June 30 shutdown. The departures are described as coordinated efforts involving repatriation and voluntary returns, rather than a single incident. The article frames the movement of people as linked to enforcement actions and the approaching end-of-June deadline, which is associated with stricter immigration measures. It does not provide detailed breakdowns by country in the available excerpt, but it indicates that Nigerians, Ghanaians and Mozambicans are among those affected. The overall picture presented is that immigration authorities are increasing checks and applying pressure that leads to departures, while the timeline and scale suggest preparations for intensified enforcement around June 30.