13 October 1987
South Africa is blamed for a massive bomb blast in Harare, Zimbabwe in which several people are injured. Unlike other Southern African Development Community (SADC) countries, Zimbabwe had had a longer relationship with the African National Congress (ANC) military wing. South African covert forces were suspected of having planted the bomb with the aim of killing members of the liberation movement living in exile there. In April that year South Africa had planted a bomb in Gaborone, Botswana that killed three people, for which they denied responsibility.  
References

Bartlett L.(1987), 'Zimbabwe blames South Africa for bombing that killed woman', from the Associated Press News Archive, 12 May, [online], Available at www.apnewsarchive.com [Accessed: 9 October 2013]