In its 4th report which was published on October 21, 2016, the OPCW-UN Joint Investigative Mechanism, established in accordance with Security Council Resolution 2235 on August 7, 2015, has declared the Syrian regime responsible for three chemical attacks that took place between 2014 and 2015, and declared ISIS responsible for one attack in Marea city in Aleppo. SNHR has published a report that highlights the chemical attacks in the period of time between the 4th report and the end of 2016.

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