A group of hackers claiming to be based in Russia said Saturday they had shut down the website of the African Cup of Nations soccer tournament in a protest at organizers holding it in the “dictatorship” of Gabon, where President Ali Bongo Ondimba retained power in disputed and violent elections last year. A person sent an email to The Associated Press claiming the group New World Hackers had “taken down” the Confederation of African Football’s official website.