Lawyers preparing for the trial of a Colorado man whose son is charged with conspiring to use weapons of mass destruction are getting more time to get ready.

A federal judge in Denver on Tuesday granted a request from federal prosecutors and attorneys for Mohammed Wali Zazi to declare the case "unusual and complex" and postpone a Dec. 7 trial date. No new trial date has been set.

Zazi, an Afghan immigrant, is accused of lying to the FBI when asked if he had spoken to anyone on the phone about whether his son, Najibullah Zazi, was in any trouble with authorities. Najibullah Zazi is being held without bond in New York on the conspiracy charge. Both have pleaded not guilty.

Mohammed Zazi is free on $50,000 bail and is being monitored electronically.