If the timeline of news reports reflects reality, then the rebels first used a yellow gas on Syrian troops and killed about 7-8 of them. At that point, Assad and the Russians realized that even reporting that fact could justify either Western Invasion or Israeli attacks on the WMD stores.
So the Russians and Chinese decided to report that Assad has full control of all his WMD. In other words, it was not Assad's WMD's used in the attack on Syrian troops. When the Israeli's read this, they concur with the Rus/Chicoms, for some undetermined reason. Any ideas why ?
So then we get word that the Syrian counter attack at Homs used a concentrated tear gas, borderline WMD. So the Syrians are dishing up some payback with borderline WMD material.
In the meantime, Emperor Zero is out body surfing at the luau.