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New york subway system last year. nbc news justice correspondent pete williams is joining us with all the developments. >> this is the plot that involved the denver man, zazi. said that he went to afghanistan to fight with al qaeda. but they said he would be more effective to go to the u.s. and stage a suicide attack. al qaeda emphasizeded need to hit a well-known building and maximize the number of casualties. but in the discussions in the u.s. the three decided that would take too much explosi...