The FBI failed to fully question a man named Zacarias Moussaoui about the terrorist.
The 9/11 commission report revealed missed opportunities to prevent the attacks is that the FBI failed to fully question a man named Zacarias Moussaoui. This man is responsible for the 9/11 attacks so if the FBI fully question this man so the attack must be prevented.
So we can conclude that the FBI failed to fully question a man named Zacarias Moussaoui about the terrorist.
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