The Khan al-Assal chemical attack was a chemical attack in Khan al-Assal, Aleppo, Syria, on 19 March 2013, which according to the Syrian Observatory for Human Rights resulted in at least 26 fatalities including 16 government soldiers and 10 civilians, and more than 86 injuries. Immediately after the incident the Syrian government and opposition accused each other of carrying out the attack, but neither side presented clear documentation. The Syrian government asked the United Nations to investigate the incident, but disputes over the scope of that investigation led to lengthy delays. In the interim, the Syrian government invited Russia to send specialists to investigate the incident. Samples taken at the site led them to conclude that the attack involved the use of sarin, which matched the