ZeroHedge has this story 24 hours before and claimed it was phosphorous.
While it is questionable if this stuff should be banned, the fact that Assad is using a banned substance tends to argue that he would have been capable of the chemical attack.
@don-o
@LonestarDream Took a look at a the video. It's impossible to tell which it is, since the video doesn't show them hitting. Thermite and phosphorus sound completely different when they go off. Phosphorus is your common or garden bang, thermite makes sort of a whooshing growl. The smoke suggests phosphorus (thermite makes more of a mushroom cloud effect until the fire gets really going) but it's not definite.
Both are nasty, but phosphorus - put it this way, we won't use it other than in flares, no matter what the need.
Sorry can't help further on that.