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S/2017/916 17-19264 7/7 substances, were circulated to States Parties in a Note by the Secretariat (S/1544/2017, dated 12 October 2017). 18. The FFM will continue its work on this incident, as well as on other allegations that have been assessed as credible, guided by Council decisions EC-M- 48/DEC.1 and EC-M-50/DEC.1 (dated 23 November 2015), as well as by United Nations Security Council resolution 2209 (2015). 19. Further to the submission of the “Report of the OPCW Fact-Finding Mission in Syria Regarding an Alleged Incident in Khan Shaykhun, Syrian Arab Republic, April 2017” (S/1510/2017, dated 29 June 2017), the Secretariat issued on 17 October 2017 a Note entitled “Further Clarifications Why the OPCW Fact- Finding Mission Did Not Deploy to Khan Shaykhun” (S/1545/2017, dated 17 October 2017). 20. The OPCW has also continued to extend its full cooperation and support to the OPCW-UN Joint Investigative Mechanism. Conclusion 21. The main focus of the future activities of the OPCW mission in the Syrian Arab Republic will be on the activities of the FFM and on the implementation of Council decisions EC-83/DEC.5 and EC-81/DEC.4, including declaration-related issues, as well as on the initial inspections at the two stationary above-ground facilities and the verification of their destruction, and annual inspections of the underground structures already verified as destroyed