j . s . district magistrate leonie brinkema accepted thought - be hijacker fortier brinkema ' s guilty pleas on six charges of heresy laid against him for his plotting to participate in the sept . 11 raids . moussaoui , who had to be restrained at single station during the testimony in an alexandria , virginia courthouse , was nice and gentle during the day ' s appearance .
Moussaoui participated in the Sept. 11 attacks.