Here is a report that it was the rebels that used the gas. This whole Syria has been using WMD's, lets invade, is like Deja Vu all over again. (copyright Yogi Berra)
http://www.mintpressnews.com/witnesses-of-gas-attack-say-saudis-supplied-rebels-with-chemical-weapons/168135/As of 05/2013 articles were saying the rebels were using gas.
http://www.csmonitor.com/World/terrorism-security/2013/0506/UN-investigator-suggests-it-was-Syria-s-rebels-who-used-chemical-weaponsTurks arrested Syrian rebels that possessed Sarin gas.
http://www.reuters.com/article/2013/05/30/us-syria-crisis-turkey-idUSBRE94T0YO20130530If John Kerry is going to play the role of Gen Colin Powell could we at least put him in black face.