text1: U.S. District Judge Leonie Brinkema accepted would-be hijacker Zacarias Moussaoui's guilty pleas on six charges of conspiracy laid against him for his plotting to participate in the Sept. 11 attacks . Moussaoui, who had to be restrained at one point during the trial in an Alexandria, Virginia courthouse, was polite and quiet during the day's appearance.
text2: Moussaoui participated in the Sept. 11 attacks.