Police escorted a convoy of commuters Monday and braced for further bloodshed after the assassination of an opposition leader and an apparent reprisal massacre.
Police said that despite stepped up security in Richmond, they could do little to stop people determined to kill their political opponents. More violence is likely, they said.
"Because of the tensions and the emotions in the area, one can expect further incidents," said provincial police commissioner Chris Serfontein.
Sifiso Nkabinde, secretary-general of the small United Democratic Movement opposition party, was shot fatally Saturday as he returned to his car from a grocery store.
He was acquitted last year of killing 16 people and once told reporters, "I know there is a bullet with my name on it."
Hours after he was slain, gunmen burst into a house and killed 11 members of a family that supported the ruling African National Congress.
The ANC expelled Nkabinde in 1997 for allegedly spying for the apartheid-era government.