The federal indictment accuses Mohammed Wali Zazi of intentionally conspiring to "alter, destroy, mutilate and conceal objects" such as masks and liquid chemicals "with the intent to impair the objects' integrity and availability" for a federal investigation into terrorism.
He pleaded not guilty and was ordered held on a permanent order of detention. He had been free on bail before Tuesday and was being monitored electronically.
Mohammed Zazi's son, Najibullah Zazi, is accused of conspiring to attack New York City with homemade bombs. Najibullah Zazi has also pleaded not guilty.
Investigators say Mohammed Zazi lied to the FBI when asked if he had spoken to anyone on the phone about whether his son was in any trouble with authorities. Najibullah Zazi is being held without bond in New York and is charged with conspiring to use weapons of mass destruction.
Federal authorities say Najibullah Zazi received explosives training from al-Qaida on a trip to Pakistan. Authorities say he planned a large-scale terrorist attack, possibly on New York City's transit system.
Court papers allege he bought and tested bomb-making materials in a Denver suburb before traveling to New York.
Click here to read the entire indictment against Mohammed Zazi.
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