How did riots in South Africa get so bad?

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Looting and violence. Days of unrest have taken their toll on South Africa’s two largest provinces: Gauteng and KwaZulu-Natal. Rioting has left stores depleted, and food supplies are now running low. Thousands of troops have been deployed to restore order. But how did this crisis begin? Host: Alan Kasujja (@Kasujja on Twitter) Guest: Vumani Mkhize, BBC reporter in South Africa. #AfricaDaily