Officials say Zazi and his co-conspirators bought beauty products in Colorado containing hydrogen peroxide and acetone -- key ingredients for homemade bombs.
Prosecutors believe Zazi received explosives training from al-Qaida in Pakistan and planned to target mass transit in the New York City area.
The 24-year-old airport van driver and former coffee cart vendor has denied wrongdoing.
Zazi's next court date has been set for Dec. 3.
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