u . s . district judge kuh brinkema accepted would - be hijackers zacarias moussaoui ' s guilty pleas on eight complaints of conspiracy laid against him for his plotting to participation in the sept . 11 murders . moussaoui , who had to be restrained at one point during the trial in an alexandria , virginia building , was polite and quiet during the day ' s appearance .
Moussaoui participated in the Sept. 11 attacks.