A Massive potential chemical attack by Al Qaeda was averted in Jordan today. "The plot would have been more deadly than anything al Qaeda has done before, including the September 11 attacks, according to the Jordanian government", says CNN.
Well, maybe. Or maybe it was intended to be a huge conventional attack; the main chemical agent in question, sulfuric acid, can apparently be used both as a blister agent or as an accelerant for a conventional explosion. Then again, according to a Jordanian scientist, the intent was to create a "chemical cloud".
Regardless, it looks like Al-Zarqawi was behind it.