Twenty-eight people were arrested in the `` extremely successful '' first joint operation , according to a statement from the South African police and South African National Defence Force . Police patrol street to restore calm after violence targeting foreigners flared . April : Police , participating in first joint operation raid three hostels . Attacks have been concentrated in Johannesburg 's poorest areas . Zimbabweans who have fled their own country are fleeing from refugee camps .
Police patrol street to restore calm after violence targeting foreigners flared . April : Police , participating in first joint operation raid three hostels . Attacks have been concentrated in Johannesburg 's poorest areas . Zimbabweans who have fled their own country are fleeing from refugee camps .