If sundry reports are to be believed, the Israelis are supporting some of the worst elements of rebels, for some reason.
DEBKA published an update quoting the Syrians as saying Israel was helping the Al Qaeda forces of Jabhat al-Nusra.
http://debka.com/newsupdatepopup/20917/Syrian-warns-of-Israel-of-%22grave-consequences%22-for-continuing-attacks