The UN report does not say who launched the attack in Syria. Culpability of the crime is now at the heart of discussion among diplomats at the United Nations. While the U.S. ambassador to the UN blames the Syrian government, the Russian ambassador warns not to jump to any conclusions.

"Some countries did not accept on faith that the samples of blood and hair that the United States received from people affected by the August 21 attack contained sarin. But now Dr. Sellstrom's samples show the same thing. And it's very important to note that the regime possesses sarin, and we have no evidence that the opposition possesses sarin," U.S. Ambassador to the UN Samantha Power said.

"Now, I think some colleagues jumped to their conclusions when they were saying that the Sellstrom report definitively proves that it was the government forces that used chemical weapons in Ghouta on August 21...We want everybody to treat it as an extremely serious technical matter and we want everybody to look at the report with the eyes of experts," Russian Ambassador to the UN Vitaly Churkin said.