I answered “other,” too, because I’m not quite sure how to classify this. I saw a television program on one of the science/learning channels (Discovery or TLC, probably) about 4-6 weeks ago, discussing the engineering of the Trade Center buildings. Basically, the program discussed how the buildings were constructed and why they collapsed. So it was a TV show about the attacks, and it showed the footage of the attacks, but in another sense the attacks were incidental to the focus of the show, which was structural engineering.
Classify that as you will.