Fighting persisted in parts of South Sudan's oil-producing region as African leaders on Thursday tried to advance peace talks between the country's president and the political rivals he accuses of attempting a coup that the government insists sparked violence threatening to destroy the world's newest country. According to AP, Kenyan President Uhuru Kenyatta and Ethiopian Prime Minister Hailemariam Desalegn met with South Sudanese President Salva Kiir on Thursday. A senior government official warned that Riek Machar, the former vice president who now allegedly commands renegade forces in the states of Unity and Upper Nile, had to renounce rebellion before the government could negotiate with him. Michael Makuei Leuth, South Sudan's information minister, said the government has not yet established formal contact with Machar. "For us, we are not talking with him," Leuth said, referring to Machar, whose whereabouts remain unknown. It was not possible to reach Machar, as his known phone numbers were switched off.