[5] On 4 January 2015, the OPCW stated that destruction was completed, though since then previously undeclared traces of compounds in a Syrian government military research site have been reported.
It estimates that those attacks were made with barrel bombs thrown from helicopters which killed 13 people — 3 in Talmenes, 8 in Al-Tamanah, and 2 in Kafr Zita.
A further three missions were initiated by OPCW in 2015, which were headed by different personnel and the reports passed through Ban Ki-Moon by Ahmet Üzümcü to the President of the Security Council in November 2015 (S/2015/908).
[10][11] The OPCW expressed "serious concern" over the Khan Shaykhun chemical attack and said that its Fact-Finding Mission in Syria was "gathering and analysing information from all available sources.
"[14] A chemical attack on Douma took place on 7 April 2018 that killed at least 49 civilians with scores injured, and which has been blamed on the Assad government.
The reconnaissance team returned to Damascus”, and at the site "the incident reportedly resulted in two fatalities and an injury to a Russian soldier."
[29][30] The OPCW Investigation and Identification Team (IIT) released its fourth report, concluding that ISIL perpetrated a sulfur mustard chemical weapons attack on Marea, Syria, on 1 September 2015.
OPCW Director-General Ambassador Fernando Arias emphasized the importance of the report in identifying chemical weapon perpetrators and highlighted the international community's responsibility to take action.