President Jacob Zuma of South Africa has appealed for calm following the murder of the white supremacist leader Eugene Terreblanche. Zuma called the killing a terrible deed. He said South Africans will not allow any one to take advantage of the situation by inciting racial hatred. Police said Mr Terreblanche, 69, was beaten to death after a dispute over unpaid wages yesterday. Two people are said to have been arrested. Mr Terreblanche, who campaigned for a separate white homeland, came to prominence in the early 1980s.