The U.N.'s Commission of Inquiry on Syria released their report on September 6, confirming the Syrian government carried out 27 chemical weapon attacks. The Syrian Observatory for Human Rights said those killed in the town of Khan Sheikhun, in Idlib province, had died from the effects of the gas, adding that dozens more suffered respiratory problems and other symptoms.
The investigators allege that United States forces failed to take all feasible precautions to avoid or minimise incidental loss of civilian life and damage to civilian objects. The report stated that the April 4 attack on the town in Syria's northwestern Idlib province had been carried out by Russian-made aircraft used by military forces answering to President Bashar Al-Assad. Investigators have so far been able to pinpoint who was responsible for the six remaining attacks which all occurred earlier in the conflict.
The UN officially accuses Assad's government of use of chemical weapons in Khan Sheikhoun in April.
The Syrian regime has continued to use sarin and chlorine gas to deadly effect throughout the war despite former U.S. president Barack Obama describing their use as a "red line" in 2012, intimating the likely use of military action.
Assad has denied using chemical weapons. At least 281 people were killed in an alleged chemical weapons attack in the Damascus suburb of Ghouta on August 21, 2013, with some reports putting the death toll at 1,729.
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The report also highlighted civilian deaths caused by USA coalition strikes in its fight against the self-proclaimed Islamic State (ISIS), including the series of strikes on a prayer hall next to a mosque in Aleppo, which resulted in dozens of civilian deaths, including children, on March 16.
The report issued on Wednesday covers a period from March to early July.
The Syrian government has denied the team access to the territory it controls.
War crimes investigators from the United Nations have reported that the Syrian government used war planes to drop sarin gas in Khan Sheikhoun in April, and the United States lacked information prior to deadly mosque bombing in Al-Jina in March.
Syrian government forces, backed by Russian and Iranian firepower and troops, on Tuesday broke a almost three-year Islamic State siege of parts of the eastern city of Deir el-Zour.
Targeting medical facilities and healthcare personnel is a war crime. A US-led coalition is also battling the extremist group in Syria. The fighting was centered around the military base of the 137th Brigade on the outskirts of Deir el-Zour, where the siege had been breached the day before. The strikes did little to impede Assad's forces.