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By Ben Makori NAIROBI (Reuters) - Kenyan park rangers piled up thousands of elephant tusks and rhino horns to burn on Saturday, sending a message to poachers and smugglers that their trade will be stopped. Armed police guarded the area, on the edge of Nairobi National Park, where a tonne of rhino horn was added to 105 tonnes of ivory in a dozen large pyres, ahead of President Uhuru Kenyatta coming to start the fire. Kenyatta has said the ceremony will show Kenya's commitment "to fighting wildlife crime and putting wildlife products beyond any economic use." The incineration will be the world's biggest after Kenya staged its first such burning in 1989.