I guess I'll add a story from the European viewpoint for a change
I was 10 at the time, so I can't really remember all of it.
I came home from school at something like 17:00. After a while my mum arrived from work. She had just heared of it on the car radio on her way home, so she yells at my dad to quickly turn the tv on. At that point the second tower was either just hit, or just about to be hit. I can't really remember, but I do know I have seen live footage of both towers collapsing.
From that moment up until I was sent to bed at around 23:00 I didn't move an inch from the tv.