A leading conservationist in South Africa, charged with smuggling rhino horns worth $14m (£10m), has insisted he has "nothing to hide". In a statement, John Hume, the former owner of what is thought to be the world's largest rhino farm, denied allegations that he trafficked the horns from South Africa to South East Asia.

Six people have been charged in South Africa in connection to an international rhino horn​ trafficking network after a seven-year investigation, officials said.