Immediately after the NRA press conference, anti-gun group Violence Policy Center released a statement pointing out that at the deadly gun attack at Columbine High School there were two armed officers on campus.
The officers were apparently outgunned by the two teenagers*. A police transcript included by VPC reads:
[Jefferson County Sheriff’s Deputy Neil] Gardner [the school’s community resource officer], seeing Harris working with his gun, leaned over the top of the car and fired four shots. He was 60 yards from the gunman. Harris spun hard to the right and Gardner momentarily thought he had hit him. Seconds later, Harris began shooting again at the deputy. After the exchange of gunfire, Harris ran back into the building. Gardner was able to get on the police radio and called for assistance from other Sheriff’s units. “Shots in the building. I need someone in the south lot with me.”