Carla Del Ponte told Swiss TV that there were "strong, concrete suspicions
but not yet incontrovertible proof".
...
Ms Del Ponte, a former Swiss attorney-general and prosecutor with the
International Criminal Tribunal for the former Yugoslavia (ICTY), did not
rule out the possibility that troops loyal to President Bashar al-Assad
might also have used chemical weapons, but said further investigation was
needed. [/i]

http://www.bbc.com/news/world-middle-east-22424188

Es ist natuerlich nicht korrekt, dass Del Ponte gesagt haette, Assad sei
es nicht gewesen.

Das Interview im Schweizer Fernsehen von 2013:
https://www.youtube.com/watch?v=MFW2IOUnG6E#t=6m45s

O'Keefe ist ein Aufschneider.