It can occur in any population given enough inflow.
Leave or die: Choice facing immigrants to South Africa
Last month, the Zulu monarch made a public statement in which he compared "foreigners" in South Africa to "amazeze" (lice or fleas) and exhorted them to pack up and go home. While many South Africans expressed shock and disgust at these utterances, with several making comparisons to hate speech during the Rwandan genocide in which Tutsis were routinely referred to as cockroaches, King Goodwill Zwelithini has claimed that he was quoted out of context, and the South African government has taken no action against him.
South Africa's Equality Act allows for prosecution in cases of hate speech and incitement to violence, while Article 3 of the UN convention against Genocide also makes provisions for "direct and public incitement to commit genocide".
Currently, several of South Africa's peri-urban settlements and urban business districts are awash with xenophobic sentiment and mob violence, with South Africans attacking, looting and even killing nationals of other countries, most of them from other parts of Africa or from South Asia.
With horrifying images and poignant victim testimony making international headlines, the Zuma administration, initially slow to react, has finally started to speak out against the savagery. But it is important to note that the mealy-mouthed language and qualified statements by the president and others have actually done little to curb the madness.
http://www.aljazeera.com/indepth/opinion/2015/04/leave-die-choice-facing-immigrants-south-africa-150420103040830.html
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