I don't think there is a "clean" version of this documentary. Let us be clear about that.
I have the commemorative DVD edition, and actually watched it again last weekend with my dad, who hadn't seen it. Viewer discretion advised, but this is a powerful documentary and should be seen by everyone age 10 & up.
If you're not sure about watching it with your kids, rent it first. The Naudets' story throughout that day is awesome, and the fact they had the video camera on & caught the first plane hitting the wtc is amazing.
Don't Miss This Documentary.
"I don't think there is a "clean" version of this documentary. Let us be clear about that."
Either my memory is faulty, which is quite possible, or I do remember seeing this documentary on TV in 2001. There was NO profanity.