JOHANNESBURG: Organizers of a peace conference that was to have been attended by five Nobel laureates in Johannesburg this week said Tuesday that they had canceled it after the South African government denied a visa to the Dalai Lama. Two of South Africa's Nobel Peace Prize laureates, the retired Anglican archbishop Desmond Tutu and former President F.W. de Klerk, condemned the government for giving in to pressure from China to block the Tibetan spiritual leader's entry into the country and said they would refuse to participate in the conference if he was not there. The executive director of the Norwegian Nobel Committee, Geir Lundestad, also said he would stay away.