1992 This incident occurred due to the ANC and the South African Communist Party leading thousands of ANC and SACP supporters over the border of Ciskei, an independent black state in South Africa. Flowers line the road 08 September 1992 in Bisho, where 24 African National Congress supporters were gunned down by Ciskeian troops 07 Sep. Nelson Mandela visited Bisho 08 Sep under heavy South African police (background) escort.