<p><br /> South African President Jacob Zuma has called for calm after the murder of white far-right leader Eugene Terre'blanche.<br /> </p><p><br /> Police have detained two black farm workers and suspect Terre'blanche was killed in a dispute over unpaid wages, but his Afrikaner Resistance Movement says he was battered and hacked to death in an attack with political overtones.<br /> </p><p><br /> Mr Zuma urged South Africans "not to allow agents provocateurs to take advantage of this situation by inciting or fueling racial hatred."<br /> </p><p><br /> Terre'blanche, 69, was the voice of hardline opposition to the end of apartheid in the early 1990s, although his party has played a marginal role since then and does not have a big following among the 10 per cent of white South Africans.<br /> </p><p><br /> Terre'blanche had lived in relative obscurity since his release from prison in 2004 after serving a sentence for beating a black man nearly to death.<br /> </p><p><br /> Concerns over increasing racial polarisation have been thrown into the open recently by a row over the singing of an apartheid-era song with the lyrics "Kill the Boer" by the youth leader of the ruling African National Congress.<br /> </p>
