Madrid has avoided criticising Rabat over last week's mass arrivals, which some commentators have interpreted as a means for Morocco to pressure Spain.
The South African Police Service (SAPS) says the Gauteng Political Killings Task Team (PKTT) has arrested suspects linked to two separate political murder investigations.
The City of eThekwini Mayor, Cyril Xaba, has described the incident in which a water tanker drove over and killed a resident in uMbumbulu as a tragic accident.