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 .
Army patrol street to restore calm after violence targeting foreigners flared . NEW : Police , military in first joint operation raid three hostels . Attacks have been concentrated in Johannesburg 's poorest areas . Zimbabweans who have fled their own country are driven from squatter camps .