(CNN)Shops looted and set ablaze.  Terrified foreigners hiding in police stations and stadiums. Machete-wielding attackers hacking immigrants to death in major cities in South Africa. As attacks against foreigners and their businesses rage on, killing at least six people this week, other nations in the continent are scrambling to evacuate their citizens from South Africa.  But this is not the first time xenophobic violence has exploded in a country that  tries to portray itself as a diverse "rainbow" nation. They started after Zulu King Goodwill Zwelithini said at a recent gathering that foreigners "should pack their bags and go" because they are taking jobs from citizens, local media reported. Shortly after his comments, violence against immigrants erupted in the port city of Durban. His office has denied he made the comments, saying  journalists misquoted him. While kings are mostly ceremonial figures in the nation, they are influential in their communities. But the United Nations said the attacks started in March after a labor dispute between citizens and foreign workers. Some citizens have accused African immigrants of taking their already scarce jobs, undermining businesses owned by locals and contributing to a high crime rate.  The nation's unemployment rate is about 25%, according to government figures. But resentment over porous borders, growing crime rates, poverty and corruption are also a major concern, analysts say. President Jacob Zuma has said his government is addressing the social and economic concerns. But he said immigrants contribute to the nation's economy and bring skills that are in demand, and should not be stereotyped as criminals. "While some foreign nationals have been arrested for various crimes, it is misleading and wrong to label or regard all foreign nationals as being involved in crime in the country," Zuma said. The nation has about 2 million documented and undocumented immigrants, which is about 4% of the total population, according to a study by the University of the Witwatersrand. Zimbabweans make  up the largest  group of immigrants. Also, South Africa is a top travel destination for wealthy Africans because of its proximity and developed infrastructure. Yes. This is the latest in a series of attacks that date back years. In January, looters burned businesses owned by foreigners in another wave of xenophobic attacks. In addition, there were other incidents of violence last year, Human Rights Watch said. Seven years ago, Johannesburg was the epicenter of more anti-immigrant tensions that left dozens dead in attacks that later spread to Cape Town. Most of the victims were Zimbabweans who had fled repression and dire economic circumstances. In those attacks, police arrested more than 200 people on various charges, including rape, murder, robbery and theft. In 2006, xenophobic violence broke out again for several months in Cape Town. Victims of xenophobic attacks have been from various African nations, including Nigeria, Somalia and Ethiopia. African nations have condemned the attacks. Kenya, Malawi and Zimbabwe are just a few of the countries evacuating their citizens from South Africa. In Zambia, local radio station QFM said it will not play South African music in solidarity with the victims. And in Mozambique, South African energy and chemical giant Sasol sent about 340 South African nationals home. The company said Mozambican employees voiced concern about reported violence against their nationals and protested the presence of South African employees in Mozambique. Most of the attacks have erupted in poor and marginalized areas. Despite the progress the nation has made since its apartheid days, inequality still remains a major concern, according to the Nelson Mandela Foundation. "It is up to the present and next generations to take up the cudgels where you (Mandela) have left off. It is up to them, through service to deepen our democracy; entrench and defend our constitution; eradicate poverty; eliminate inequality; fight corruption, and serve always with compassion, respect, integrity and tolerance," the foundation said in a statement. "Xenophobia, racism and sexism must be fought with tenacity, wisdom and enlightenment." As fears of more attacks grow, South Africans have taken to social media and the streets to protest xenophobia and violence.
Zimbabweans make up the largest group of immigrants in South Africa .
Attackers have targeted foreigners and their businesses .