u . s . district judge qadi brinkema dismissed would - be hijacker zacarias moussaoui ' s guilty pleas on two charges of conspiracy laid against him for his plot to participate in the sept . 11 attacks . prosecutors , who had to be restrained at each point during the trial in an alexandria , virginia courthouse , was polite and quiet during the evening ' s face .
Moussaoui participated in the Sept. 11 attacks.