Four miners have been shot and injured, apparently by security guards using rubber bullets at a gold mine owned by the South African president's nephew and a grandson of anti-apartheid icon Nelson Mandela.
Today's shooting comes after firebrand politician Julius Malema visited the Aurora gold mine last week and told fired mineworkers that he was going to make South African mines ungovernable.
Police spokeswoman Pinky Tsinyane said four miners were shot and that police have arrested four people for public violence.
Two weeks ago, police killed 34 striking miners at a platinum mine.
Scores of miners arrested at the scene of that mass shooting north-west of Johannesburg are still waiting to be released.