Meanwhile, conditions in South Africa begin to worsen due to Vorster's heavy-handed attempts at silencing domestic opposition. His use of lethal force against white dissenters and other Afrikaners in particular leads to militant secessionist movements in the Transvaal and Orange Free State. The fledgling regime also alienates the Inkatha Freedom Party and nominally independent KwaZulu, which results in a violent insurgency waged by Zulu radicals across Natal and an urban insurrection in Durban. SADF units in Cape Town also mutiny and intervene to protect civilians after several mass killings.