u . s . district attorney leonie pohl refused would - be ringleader zak moussaoui ' s guilty testimony on twelve charges of deception laid against him for his plotting to participate in the sept . 11 murders . prosecutors , who had to be restrained at two level during the trial in an alexandria , virginia courthouse , was gentle and polite during the day ' s appearance .
Moussaoui participated in the Sept. 11 attacks.