UN Secretary General Ban Ki-Moon said that the report to the Security Council on the chemical weapons attack in Syria made for "chilling" reading.
He said: "The report makes for chilling reading. The team gathered testimony from survivors, medical personnel and first responders. They collected biomedical evidence and dozens of soil and environmental samples.
"The results are overwhelming and indisputable."
While the UN confirmed that sarin was used in a chemical weapons attack, conventional weapons are still destroying families in Syria.
The UN Secretary General has said there is "overwhelming and indisputable" evidence that chemical weapons were used in an attack in Syria.