One of five suspects was shot dead during a police chase following an attempted hijacking in Blairgowrie, Johannesburg, also on April 12.
Police said the five suspects tried to hijack a vehicle in the area at around 5am. When being chased by police one suspect was shot dead; the four others were arrested.
The police said the four face charges of attempted hijacking and possession of illegal firearms.
A Durban bus driver was shot dead in Newlands West on April 9. The 23-year-old was alone in the bus before being shot in the chest.
Police said the man was declared dead on the scene due to multiple gun shot wounds. A case for murder has been opened.