A look back at the first chemical attack in... by debunkerbuster
I'm personally not absoving any side of anything completely as it pertains to chemical weapons, including the US. We should stay out of this mess.
Use of chemical weapons in the Syrian Civil War has been confirmed by the United Nations. Deadly attacks during the war included the Ghouta attack in the suburbs of Damascus in August 2013 and the Khan al-Assal attack in the suburbs of Aleppo in March 2013. While no party took responsibility for the chemical attacks, the Syrian Ba'athist military was seen as main suspect, due to a large arsenal of such weapons. A U.N. fact-finding mission and a UNHRC Commission of Inquiry have simultaneously investigated the attacks. The U.N. mission found likely use of the nerve agent sarin in the case of Khan al-Asal (19 March 2013), Saraqib (29 April 2013), Ghouta (21 August 2013), Jobar (24 August 2013) and Ashrafiyat Sahnaya (25 August 2013). The UNHRC commission later confirmed the use of sarin in the Khan al-Asal, Saraqib and Ghouta attacks, but did not mention the Jobar and the Ashrafiyat Sahnaya attacks. The UNHRC commission also found that the sarin used in the Khan al-Asal attack bore "the same unique hallmarks" as the sarin used in the Ghouta attack and indicated that the perpetrators likely had access to chemicals from the Syrian Army's stockpile. Those attacks prompted the international community to pressure disarmament of the Syrian Armed Forces from chemical weapons, which was executed during 2014. Despite the disarmament process, dozens of incidents with suspected use of chemical weapons followed throughout Syria, mainly blamed on Syrian Ba'athist forces, as well as the Islamic State of Iraq and the Levant and even on Syrian opposition forces.
In August 2016, a confidential report by the United Nations and the OPCW explicitly blamed the Syrian military of Bashar al-Assad for dropping chemical weapons (chlorine bombs) on the towns of Talmenes in April 2014 and Sarmin in March 2015 and ISIS for using sulfur mustard on the town of Marea in August 2015. Several other attacks have been alleged, reported and/or investigated. In 2017, the 2017 Khan Shaykhun chemical attack drew international attention and provoked the first U.S. military action against the Syrian government.