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 the 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 the likely use of the nerve agent sarin in the case of Khan al-Assal ( 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 on Syrian opposition forces and Turkish Armed Forces . There have been a number of evidence-gathering processes developed at the international level In August 2016 , reports 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 and Qmenas 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
Ghouta attack
Ghouta chemical attack
Use of chemical weapons in the Syrian Civil War