A/HRC/34/18 • Working Group on the use of mercenaries as a means of violating human rights and impeding the exercise of the right of peoples to self-determination • Independent Expert on the enjoyment of all human rights by older persons • Special Rapporteur on contemporary forms of slavery, including its causes and consequences • Special Rapporteur on the negative impact of unilateral coercive measures on the enjoyment of human rights • Special Rapporteur on the human right to safe drinking water and sanitation • Working Group on Arbitrary Detention • Working Group on Enforced or Involuntary Disappearances • Working Group of Experts on People of African Descent • Special Rapporteur on the situation of human rights in Cambodia • Independent Expert on the situation of human rights in the Central African Republic • Independent Expert on the situation of human rights in Somalia • Independent Expert on the situation of human rights in the Sudan 22. Special procedure mandate holders also presented reports on their visits to 20 countries and territories. The Working Group on the use of mercenaries as a means of violating human rights and impeding the exercise of the right of peoples to selfdetermination further presented a report on its mission to the European Union. In addition to its annual report, the Working Group on Enforced and Involuntary Disappearances presented a follow-up report on its missions to the Congo and Pakistan. 23. The Working Group on Arbitrary Detention further presented a report containing revised methods of work. 24. The special procedures also presented a report on communications sent by all mandate holders between 1 March and 31 May 2016. 5