All those who were part of the hearing, including witnesses, had subsequently been attacked in some way before and during the inquiry.
A security guard, 44, and his son, 24, were fatally shot at their home in Snathing Location in January.
Another security guard was shot and injured in Imbali in January 2019.
The home and car of the presiding officer was torched after he received death threats in July 2019.
The case was investigated by the provincial organised crime investigation unit, who arrested the accused over the weekend.
“The investigation is ongoing and more arrests cannot be ruled out,” said police spokesperson Col Thembeka Mbele.
All three matters were adjourned until November 24.
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