If there was another attack, I doubt it would be aerial, hijacked planes are what everyone would be expecting. I think the attack will be something much more aggressive.
If I were to pick a WMD style, it'd definitely be a Nuclear Attack. While I believe Biological attacks are MUCH deadlier than Nuclear ones (Chemicals being the least deadly, IMO), Nuclear Attacks provide a much better "Visual Representation" of impending doom, and people would be more likely to hand over their freedoms in exchange for security (It's easier for the gov't this way).
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