Supporters of white supremacist Terreblanche protest yesterday as his alleged killers appear in cour

The official probe was launched into a group set up by alleged supporters of firebrand politician Julius Malema.

One entry, emailed to football fans around the world, calls for the “rape and slaughter” of whites and the murder of President Jacob Zuma.

In a chilling message a Malema “fan” called Thato Mbateti Mbateti warns: “Every trespasser, namely white whores, we will rape them and kill them... White kids will be burned.”

The campaign comes amid growing tensions in South Africa after the murder of white supremacist Eugene Terreblanche.

Yesterday angry crowds clashed outside a court in Ventersdorp, near Johannesburg, as two black farm workers, aged 15 and 21, appeared accused of killing the 69-year-old who had campaigned for all-white states within South Africa.

Bitter memories of the apartheid era were evoked when 2,000 people gathered and police used razor wire to separate the factions. The case was adjourned until next week.