The bodies of two women and two men aged between 40 and 50 were discovered with gunshot wounds in Constantia, an affluent suburb of the South African port city, police stated.
"The motive for the multiple murders is yet to be determined," police said adding an investigation has been opened.
Police did not identify the victims, but one of the deceased was believed to be Krasimir Kamenov, a high-profile Bulgarian organized crime figure, according to judicial and government sources in Sofia.
According to an Interpol red notice, Kamenov, 55, is wanted on charges including murder and extortion.
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