Maybe the Rebels used the gas. Plus Russia could be involved in Med buildup. http://english.pravda.ru/russia/politics/12-06-2013/124816-russia_mediterranean_fleet-0/
Could be a big mess. This is a civil war. We don’t belong there.
I consider that to be equally possible. More possible because the rebels would know that the government would be blamed and the Arabs have a long history of agent provocateur false flag operations. They know how to play the media.