7 November 2017 – The Islamic State of Iraq and the Levant (ISIL/Da’esh) was responsible for using sulfur mustard in a September 2016 attack in Umm Hawsh and the Syrian Government was accountable for the release of sarin in an April 2017 attack in Khan Shaykhun, the head of a Security Council-mandated investigation said Tuesday.

“There has been sufficient evidence of a credible and reliable nature to make its findings,” said Edmond Mulet, Head of the Organisation for the Prohibition of Chemical Weapons-UN Joint Investigative Mechanism (OPCW-UN JIM), during a briefing on the entity’s latest findings, released on 26 October.

He said that despite the challenges of investigating complex cases during an armed conflict, the Mechanism has taken great care to ensure that its methodology and findings were technically and scientifically sound.

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