I was in Mrs. Dabrowski's kindergarten class. At the time, I didn't really know what happened. The school didn't say a word, they didn't want to scare us. But a lot of parents took their children out of school, my mother did. When I got home, I remember seeing all the names and pictures of the people who died. To this day at that school, if 9-11 falls on a school day, they have a memorial service, where, no matter what everyone is doing, they stop everything and we would sit and be quiet at from the time the first tower was hit, for 10 minutes. My high school does not do this though.
Ironically, I remember that in kindergarten, when the towers were hit, we were having "coloring time" and the topic of the day was to draw something with New York City. Most of us drew the Statue of Liberty, or tall skyscrapers or the skyline. And on the skylines, every kid drew the twin towers. We were confused when our teacher told us they weren't there anymore.