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South Africa on Sunday vowed to hunt down those behind a wave of attacks targeting immigrants, saying 307 people had been arrested over violence that has left at least seven people dead. The government stepped up its response to unrest in Johannesburg and the eastern coastal city of Durban, with Home Minister Malusi Gigaba resolving to end "all acts that seek to plunge our country into anarchy". Rioting and looting over the last two weeks have exposed tensions between South Africans and immigrants from across the continent, including Zimbabwe, Somalia, Ethiopia and Malawi. President Jacob Zuma on Saturday cancelled a state visit to Indonesia to deal with surge in violence, and pleaded with foreigners to stay in South Africa.