Pardon me, if someone already posted this on this thread -- I can't quite read all the posts, but I think this info is important:
Al-Qaida Terror Plot (w. biologican and chemical weapons) Foiled, Say French Police
http://www.freerepublic.com/focus/news/1056038/posts The French police are convinced that their country has escaped a planned chemical or biological attack by an Islamist cell linked to al-Qaida. An interior ministry official said evidence from Islamist militants arrested in the Lyon area last week made it "very plain" that an attack with the deadly botulism or ricin toxins was being actively prepared.
As little as one drop of the botulism toxin released into a building's ventilation system can be fatal. Ricin is one of the deadliest poisons to occur naturally, many times deadlier than cyanide and capable of being given in food and drink without affecting the taste.
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If they plan it in Europe, you can bet they are planning it in the US also.