A Question

I heard a question asked at the confirmation hearings today (only got the chance to watch a few minutes of it). I'm curious of what people think about September 11th and why they think the way they do. Do you view the events of September 11, 2001 as: 1. An act of war. (an attack) 2. A criminal act. (a tragedy) 3. Just one of those things that happens. (an unfortunate event) I'd like to know how people view it and why.... Thanks in advance for any responses.