"The ABC report cited unnamed authorities as saying "Zazi brought with him instructions on how to build a bomb using household chemicals.""
http://www.freerepublic.com/focus/news/2339523/posts?page=246#246
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OK, time for a review...
If you see an odd package (ie suitcase, box, backpack, plastic container — like a tupperware bowl with lid, for example) sitting by itself DO NOT TOUCH IT. Contact the authorities. Do not feel foolish. Let the authorities open it, pick it up, examine it, whatever. DO NOT TOUCH IT.