A/HRC/34/34 I. Engagement with other parts of the United Nations system and regional mechanisms 31. Throughout the year, mandate holders sought closer cooperation with the wider United Nations system and agencies, programmes and funds, as well as with regional mechanisms (see A/HRC/34/34/Add.1, chap. I), including by raising awareness on their mandates and conducting joint activities. 32. In June 2016, the Special Rapporteur on trafficking in persons, especially women and children, participated in an open debate held by the Security Council on the theme “Conflict-related sexual violence: responding to human trafficking in situations of conflictrelated sexual violence”. Her work also informed the report of the Secretary-General on the implementation of measures to counter trafficking in persons submitted to the Security Council (S/2016/949). 33. The Special Rapporteur on contemporary forms of slavery, including its causes and consequences, in planning and conducting her mission to El Salvador, from 18 to 29 April 2016, engaged extensively with, among others, the International Labour Organization, the United Nations Development Programme (UNDP), the International Organization for Migration and the United Nations Children’s Fund (UNICEF). The Special Rapporteur on the situation of human rights in the Palestinian territories occupied since 1967, during his annual mission to the region, met with representatives of the United Nations Relief and Works Agency for Palestine Refugees in the Near East, and continued to engage with them throughout the year. 34. In November 2016, the Special Rapporteur on the rights of persons with disabilities was appointed as a member of the Advisory Board of the Global Study on Children Deprived of Their Liberty. The Special Rapporteur on the human rights to water and sanitation was made a member of the task force on monitoring inequalities in access to drinking water, sanitation and hygiene for the Sustainable Development Goals led by the World Health Organization and UNICEF. 35. On 3 May 2016, the Special Rapporteur on the right to freedom of opinion and expression issued a joint declaration with media representatives of the Organization for Security and Cooperation in Europe, the Inter-American Commission on Human Rights and the African Commission on Human and Peoples’ Rights on freedom of expression and countering violent extremism.4 Moreover, the preliminary observations of the Special Rapporteur made at the end of his country visit to Turkey, from 14 to 18 November 2016, were included in the report of the Committee on Culture, Science, Education and Media of the Council of Europe.5 36. On 28 September 2016, the Special Rapporteur on the right to truth, justice, reparation and guarantees of non-recurrence participated in an expert round table, held in Brussels, on exploring enhanced cooperation between the European Union and the African Union on transitional justice. 37. From 28 to 30 November 2016, the Special Rapporteur on the situation of human rights in Eritrea visited Addis Ababa, where she engaged with African Union interlocutors to follow up on the recommendation of the Commission of Inquiry on Human Rights in Eritrea that the African Union establish an accountability mechanism to investigate, 4 5 OHCHR, “Joint declaration on freedom of expression and countering violent extremism”, 3 May 2016. Council of Europe, “Attacks against journalists and media freedom in Europe”, Committee on Culture, Science, Education and Media, 8 December 2016. 7