A/HRC/33/37 3. Targeted assassinations 46. A former senior officer of the National Defence Force confirmed to the independent experts the existence of several lists of people, including civilians and military personnel, to be eliminated by the security forces. 47. Armed elements in opposition to the Government have also been involved in several murders, notably targeted assassinations. The independent experts documented a case of a member of the Imbonerakure being burned alive. Grenade attacks have also allegedly been carried out by the armed elements, causing casualties among the population. From May 2015 to February 2016, the OHCHR office in Burundi documented several cases of grenades thrown by unknown individuals in public places, mainly in Bujumbura. 48. Apparent examples of tit-for-tat targeted assassinations within the army — particularly threatening to the integration of the armed forces — include the killings of several senior army officers belonging either to the pre-Arusha Agreement Burundian armed forces or to the Armed Political Parties and Movements (a former rebel group), and the apparent retaliatory killings of alleged supporters of the regime within the forces. Among the most emblematic examples are the killings of General Adolphe Nshimirimana on 2 August 2015, of General Athanase Karakuza on 25 April 2016 and of Colonel Darius Ikurakure on 22 March 2016. The latter was shot dead in the compound of the headquarters of the army’s joint staff. 49. Human rights activists and their relatives have been primary targets. For instance, on 3 August 2015 Pierre Claver Mbonimpa, a leading human rights activist and representative of the Association for the Protection of Human Rights and of Detainees, was shot in the cheek and arm during an apparent assassination attempt. On 6 August 2015, his son, Welly Fleury Nzitonda, was arrested; he was later killed in the Mutakura neighbourhood of Bujumbura. On 9 October 2015, Mr. Mbonimpa’s son-in-law, Pascal Nshimirimana, was killed by firearm and grenades as he was returning home in Ngangara. B. Enforced disappearances 50. Many persons have disappeared since the beginning of the crisis, often following their arbitrary arrest by the security forces, notably the National Police and the National Intelligence Service. The victims include members of the opposition members and civil society and demonstrators. The independent experts met relatives of people arrested by elements of the security forces who were never seen again. They were unable to obtain any information from the authorities regarding the fate or whereabouts of the persons concerned. 51. Marie-Claudette Kwizera, Treasurer of the civil society organization Ligue Iteka was allegedly arrested on 10 December 2015 by the National Intelligence Service and has not been seen since. On 22 July 2016, Jean Birgimana, a journalist for the Iwaku newspaper, was also allegedly arrested by the National Intelligence Service and has been missing since then. 52. The independent experts have also received information and names from witnesses concerning the existence of a group of 12 well-known intelligence, police and military agents who have allegedly been responsible for many cases of enforced disappearances and who report directly to the inner circle of the executive branch. 9