updated 2/1/2010 6:05:41 PM ET 2010-02-01T23:05:41

The father of an airport driver accused of trying to cook up homemade bombs in a Colorado motel for an attack on New York City was charged Monday with trying to get rid of chemicals and other evidence.

FBI agents arrested Mohammed Wali Zazi on Monday at his home in a Denver suburb. A previous charge, lying to the government, was dropped. He had been out on bail.

The new court charge unsealed in federal court in New York City accused Zazi of conspiring with others to destroy or hide "glasses, masks, liquid chemicals and containers" that were evidence in a foiled terrorism plot.

Zazi, the father of suspect Najibullah Zazi, appear in federal court in Denver on Monday where he was advised by U.S. Magistrate Judge Michael J. Watanabe of the charges pending against him.

Through his court-appointed attorney, Zazi waived his right to a detention hearing and will remain in custody without bond pending a resolution to the case. He also waived his right to identity and removal hearings, essentially agreeing to allow for his transfer to New York.

Prosecutors allege that Najibullah Zazi and others bought beauty supplies in Colorado to make peroxide-based bombs and that he tried to mix the explosives in a hotel room there. In early September he drove to New York, where investigators say they lifted notes on bomb-making from his computer.

Authorities have said they believe the younger Zazi, who was arrested in September, wanted to attack New York's transit system — something U.S. Attorney General Eric Holder called one of the most serious terrorism cases since the terrorist attacks of Sept. 11, 2001.

Two other men, both former high school classmates of Najibullah Zazi, have also been charged but were not directly linked to the foiled bomb plot. Authorities have said the two — Adis Medunjanin and Zarein Ahmedzay — traveled to Pakistan, where Zazi allegedly received training in explosives from al-Qaida.

Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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