BLOOMBERG (Agencies) South African anti-immigrant attacks have claimed at least 50 lives since May 11, with a further 22 arrests made overnight, South African police said. Thousands of foreigners are still seeking shelter at police stations and sports grounds, police said. Fighting started almost a week ago in Johannesburg's northern township of Alexandra and spread yesterday to other provinces. Several of the arrests made by police last night were in North West province and Kwa-Zulu Natal after shops were looted, shacks of foreigners burnt and some Malawians and Zimbabweans assaulted. "The situation is quiet at the moment," Gauteng Police Spokesman Director Govindsamy Mariemuthoo said in a telephone interview today. "To date, 589 arrests have been made," on charges of public violence, malicious damage to property, and grievous bodily harm. While Zimbabweans, driven south by a decade of political violence and economic recession in their homeland, bear the brunt of the attacks, smaller South African ethnic groups are also being targeted. Some shanty-town residents see Zimbabwean immigrants, numbering about 3 million, and other Africans in the country as rivals for jobs and housing. A man was killed in Springs, near Johannesburg, last night by a member of the South African National Defence Force, General Kwena Mangope said in an interview from Pretoria today. The man was assaulting a woman and pointed a gun at an SADF member, who shot him. A battalion of 850 to 900 soldiers is on standby to help police if called upon. Xenophobic violence in Johannesburg has forced at least 20,000 people, including Mozambicans and Somalis, to seek refuge at police stations and community halls. More than 15,300 Mozambicans have returned to their country as they flee attacks, Mozambique's state-owned media reported today. South Africa's "government should ensure that victims of xenophobic violence remain in South Africa to participate in bringing their attackers to justice," Human Rights Watch said in an e-mail today. "Many of the victims of xenophobic attacks are undocumented foreign nationals who fled unrest in their countries and are hesitant to participate in the justice process, fearing arrest and deportation because of their status." Human Rights Watch said that the courts, which are processing the arrests made, have already dropped several cases owing to lack of proof and that "urgent government intervention is needed to encourage witnesses to provide evidence." As many as 5,000 people from non-governmental organizations, communities affected by the violence and social movement groups joined an anti-xenophobia protest in central Johannesburg and the suburb of Hillbrow today, Dale McKinley of the Coalition Against Xenophobia said in a telephone interview. The protesters delivered a memorandum to provincial government demanding security for foreigners and humanitarian support. South Africa, with a population of 48.5 million, has a shortfall of 2.4 million houses and one in four South Africans doesn't have a job.