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

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.