Terrorist warnings in the U.S.
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Najibullah Zazi arrives at the offices of the FBI in Denver for questioning on Thursday, Sept. 17, 2009. Zazi, identified by law enforcement as having a possible link to al-Qaida, was questioned by agents for hours on Wednesday and returned Thursday afternoon for further questioning. The FBI searched Zazi's apartment and the home of his aunt and uncle, both in the east Denver suburb of Aurora.
AP Photo/Ed Andrieski
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