A/72/53/Add.1 15. Calls upon the Syrian authorities and all other parties to the conflict to ensure the effective implementation of Security Council resolutions 2139 (2014) of 22 February 2014 and 2254 (2015), and, in particular, to end the arbitrary detention and torture of civilians in the Syrian Arab Republic, notably in prisons and detention facilities, as well as kidnappings, abductions and forced disappearances, as demanded by the Council in its resolution 2139 (2014); 16. Condemns the denial of medical services in all prisons and detention facilities; 17. Recognizes the permanent damage that torture and ill-treatment, including sexual abuse and violence, causes to its victims and their families; 18. Calls for the appropriate international monitoring bodies to be granted immediate access without undue restriction to all detainees, and for the Syrian authorities to publish a list of all detention facilities; 19. Calls upon all parties to the conflict to cease the mistreatment and torture of detainees and to allow access to medical services for all detainees; 20. Demands the immediate release of all persons arbitrarily detained, including women, children, human rights defenders, humanitarian aid providers, medical personnel and journalists; 21. Recalls the decision of the Security Council that the Syrian Arab Republic shall not use, develop, produce, otherwise acquire, stockpile or retain chemical weapons, or transfer, directly or indirectly, chemical weapons to other States or non-State actors,48 and, in keeping with the decision of the Council, expresses its strong conviction that those individuals responsible for the use of chemical weapons in the Syrian Arab Republic should be held accountable; 22. Expresses grave concern at the use of sarin in Khan Shaykhun on 4 April 2017, resulting in approximately 100 fatalities, and the use of sulphur mustard in Umm Hawsh on 16 September 2016, as concluded by the Organisation for the Prohibition of Chemical Weapons, and looks forward to the results of the investigations into these incidents by the Organisation for the Prohibition of Chemical Weapons-United Nations Joint Investigative Mechanism; 23. Recalls with grave concern the report of the Commission of Inquiry identifying the Syrian air force as responsible for the sarin gas attack on Khan Shaykhun on 4 April 2017;49 24. Expresses grave concern at the reports of the Technical Secretariat of the Organisation for the Prohibition of Chemical Weapons of July 2016, March 2017 and July 2017, according to which the Technical Secretariat was not able to verify that the Syrian declaration regarding its chemical weapons programme was accurate and complete, and calls upon the Syrian Arab Republic to cooperate fully with the Organisation to further clarify remaining gaps, inconsistencies and discrepancies in its declaration; 25. Recalls the reports of the Joint Investigative Mechanism of 24 August and 21 October 2016,50 and expresses grave concern at its findings that the Syrian armed forces were responsible for the use of chemical weapons (chlorine) in three attacks in the Syrian Arab Republic — in Tallmannis in 2014 and in Qaminas and Sarmin in 2015 — and that the so-called Islamic State in Iraq and the Levant (Da’esh) was responsible for one sulphur mustard attack in the Syrian Arab Republic, in Marea in 2015; 26. Condemns in the strongest possible terms the use of chemical weapons in the Syrian Arab Republic, as reported by the Joint Investigative Mechanism, which violates the Chemical Weapons Convention, Security Council resolution 2118 (2013), and the decisions of the Executive Council of the Organisation, including decision EC-M-33/DEC.1, as well as the use of chemical weapons in contravention of well-established international standards and norms against such use, and expresses its strong conviction that those individuals responsible for the use of chemical weapons must be held accountable; 48 49 50 GE.17-18194 See Security Council resolution 2235 (2015). See A/HRC/36/55. See S/2016/738/Rev.1 and S/2016/888. 53