Angola's attorney general has summoned witnesses to testify in a case that implicates some of the top figures in the country's military and security establishment in acts of torture and murder in the diamond fields of north-eastern Angola. The witnesses' hearings will start on 5 March in Luanda. Respondents in the case include General Manuel Hélder Vieira Dias "Kopelipa", Minister of State and head of the Military Bureau in the Angolan presidency, as well as a close confidante and business associate of President José Eduardo dos Santos. The case was brought before the attorney general, on 14 November 2011, by Angolan human rights activist Rafael Marques de Morais, who has been investigating rights abuses connected with the diamond industry since 2004.