The death toll in the province where the violence began on Friday has risen to 26, Sihle Zikalala told a press conference.
The army was called in on Monday to contain the violence in South Africa, on the fourth day of violence initially triggered by the imprisonment of former president Jacob Zuma.
Incidents broke out on Friday in Zulu country, where Mr Zuma is originally from and where he was imprisoned after being sentenced to 15 months for contempt of court.
The unrest has spread to the poorer areas of Johannesburg where Mr Zuma’s fate is largely irrelevant.
President Cyril Ramaphosa has appealed to South Africans to consider the consequences of their actions.
“The path of violence, of looting and anarchy leads only to more violence and devastation. As well as suffering, it leads to more poverty, more unemployment and more loss of innocent life. This is not who we are as South Africans, this is not us.” President Ramaphosa said.