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killed when the twin towers collapsed. and there is tight security in new york and washington this weekend as people gather to mark the anniversary. police and the fbi are on high alert looking for any signs of a terror plot. u.s. officials say they received information of a credible, yet unconfirmed plot to attack those cities. our susan candiotti joins us now from new york. do we know what law enforcement may be looking for? any more details on that potential plot? >> reporter: yes, fredericka, hello. cnn is learning new details about the timing of this possible conspiracy. at leas...

Familiar with the name we've been watching closely in here. he's not like osama bin laden he's operating in a specific way. the story is that he and his other cohorts went over to train and he spoke to him directly eye corresponding to these reports and he decided you guys are righting in afghanistan that's right. i think you would be excellent suicide bombers and we want you in the front in the united states. >> reporter: the united states missed a plot that involved the pakistani taliban and an al-qaida operative operating openly in pakistan and the pakistani intelligence missed that? this i...