KABUL, Aug 18 (Reuters) - The leaders of Afghanistan"s Taliban will show themselves to the world, an official of the Islamist movement said on Wednesday, unlike during the past 20 years, when its leaders have lived largely in secret. "Slowly, gradually, the world will see all our leaders, there will be no shadow of secrecy," the senior Taliban official, who declined to be identified, told Reuters. The official said Taliban members had been ordered not to celebrate their recent sweep of the country, which brought them to the capital, Kabul, on Sunday, and added that civilians should hand over weapons and ammunition. Reporting by Kabul bureau; Editing by Robert Birsel and Clarence Fernandez Our Standards: The Thomson Reuters Trust Principles.