The following lists events that happened during 1989 in South Africa. Incumbents State President: P.W. Botha (until 15 August). F.W. de Klerk (acting from 15 August, incumbent from 20 September). Chief Justice: Pieter Jacobus Rabie. Events January 8 – The African National Congress announces that it will start dismantling its guerrilla camps in Angola in support of the peace process. 18 – State President P.W. Botha has a mild stroke. 19 – Chris Heunis, Minister of Constitutional Development and Planning, is appointed Acting State President. An Eskom sub-station in Glenwood, Durban is damaged by an explosion and police later defuses a second bomb found nearby. An explosion occurs at the home in Benoni of the chair of the Ministers Council in the House of Delegates. An explosion occurs at an aircraft factory in Ciskei. Two municipal police members are killed in a grenade attack on Katlehong's Municipal Police Station. February 2 – An ailing State President Pieter Willem Botha steps down from the leadership of the National Party, but remains state president. Trevor Manuel is released from detention under stringent restriction orders. An explosion at a municipal police barracks in Soweto injures four policemen. An explosion next to a police parade in Katlehong kills a municipal constable and injures nine others. A limpet mine explodes at the home of the commander of the Katlehong Police Station, Col. D. Dlamini. March 15–21 – A conference of African National Congress chief representatives and regional treasurers takes place in Gran, Norway. An explosion occurs outside the Natal Command HQ on Durban's beachfront. April 2 – SWAPO violates the border war cease-fire by invading South West Africa from Angola and nearly 300 are killed. May 5 – Three South African Embassy staff are ordered to leave Britain within 7 days because of the attempted smuggling of a Blowpipe missile. The South African Air Force's Klippan Radar Station in the Western Transvaal comes under mortar attack. June Four bystanders are injured when a limpet mine explodes under a police vehicle in Duduza. A limpet mine explodes under a vehicle parked outside a policeman's home in Tsakane. A grenade is thrown at a police patrol in Tsakane. A limpet mine explodes in a rubbish bin outside the home of a policeman in Soweto. A bomb shatters the windows of KwaThema Police station's dining hall. A limpet mine explodes at the Police single quarters in Ratanda. A