The Independent International Commission of Inquiry on the Syrian Arab Republic was set up by the United Nations Human Rights Council ( UNHRC ) on 22 March 2011 to investigate human rights violations during the Syrian civil war . In its report dated 12 February 2014 they confirmed the use of sarin in the case of Khan Al-Assal ( 19 March 2013 ) , Saraqib ( 29 April 2013 ) and Al-Ghouta ( 21 August 2013 ) . 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 . In none of the incidents , however , was the commission 's " evidentiary threshold " met in regards to identifying the perpetrators of the chemical attacks
Ghouta attack
Ghouta chemical attack
Use of chemical weapons in the Syrian Civil War