MaryAnne Jacobs, assistant librarian at the school, told how she hid with 18 first grade children in a storage cupboard to avoid the gunman.
She said she followed the usual drill for emergency procedures, telling the children to be quiet and sit down before taking them initially to a place they thought safe and then to the room normally used to house servers for the library computers.
"We just told them it was a drill, they knew what to do," she said, fighting back tears.
"We knew it was gunshots first all because we made the phone call. I think they were like 'what is that? What is going on' but I don't think they really had any idea.
She added: "They weren't crying.
"We had to crawl out of the space we were in because we discovered one of our doors was unlocked and we locked ourselves in a back storage room where we have some (computer) servers inside the library.
"At that point they were a little freaked out I think, there were some crayons and paper so we tore up paper and gave them all something to do. It was hard to just keep them quiet and calm."
She said they barricaded the door with filing cabinets, only opening it when a police officer slid an identification badge underneath.
