Here's my 9/11/01 story. I was sitting in my 7th grade math class, and the principal came over the PA system and told us about the attacks. I believe it was about 10:30 am, and then we turned on the TV, and I remember the Today show was still on, and there was mass confusion about what had happened. I believe by that point both towers had fallen, and there were reports about something happening in Washington. The rest of the day, we didn't really do anything else but keep the TV on watching the news.
I was in 4th grade at the time of the attacks and wasn't aware of the story until I went home. There was no mention of it at school that day, and I didn't see anything unusual going on such as students leaving, etc. I didn't know about it until I arrived home shortly after 4PM that day.
Generally, they tend not to tell elementary schoolers these types of things in school...