UN Syria Chemical Weapons

A report by Prof. Ake Sellstrom, left, head of the UN mission to investigate allegations of the use of chemical weapons, did not determine whether the government or opposition were responsible for the alleged attacks in Syria. (Bebeto Matthews/Associated Press)

UN inspectors say chemical weapons have been used in the Syrian conflict, definitely in a widely publicized Aug. 21 attack near Damascus and probably in four other locations between March and late August.

The report by UN chemical weapons experts led by Swedish professor Ake Sellstrom did not determine whether the government or opposition were responsible for the alleged attacks.

Sellstrom issued an initial report on Sept. 16 which concluded that evidence collected in the Ghouta area of Damascus following an Aug. 21 attack provided "clear and convincing evidence that surface-to-surface rockets containing the nerve agent sarin were used." Graphic video footage showed dozens of people gasping for air and bodies lined up.

Thursday's report said evidence indicated chemical weapons were also probably used in Khan al Assal, Jobar, Saraqueb and Ashrafiah Sahnaya.