United Nations Secretary General Ban Ki-Moon is forming an investigative body to look into which side is responsible for using chemical weapons to kill more than two dozen people in the Syrian Civil War.

Ban wants the World Health Organization (WHO) to work with the Organization for the Prohibition of Chemical Weapons (OPCW) that oversees the international chemical weapons treaty to which 188 nation belong.  Syria is not one of them.

At least 26 people died in the attack in the north of Syria.  The government and the rebels blame each other.  The American Central Intelligence Agency says Syria has had an active chemical weapons program for some time and possesses mustard gas (used in World War I) and sarin (used by a terrorist cult in the Subways of Tokyo in 1995).

Syria’s largest ally Russia is backing the investigation, as long as it is restricted to this week’s attack at Khan al-Assal.