nashville, releasing dramatic body cam video of officers arriving at the scene, searching for and confronting that killing the shooter. this was after the shooter opened fire at a private christian elementary school, killing three children and three adults. police say they don t know the motive, but they also say the attack was quote calculated and planned. i want to bring in cnn s tom foreman. he s at the magic wall for us to explain what we ll see in this body cam video. which many of you we want to warn, you may find disturbing. also we re joined by ed davis, the former boston police commissioner, and cnn law enforcement analyst, michael finnegan of former d c. metropolitan police officer. gentlemen thank you very much for being here, tom. let me start with you. you ve been covering school shootings since before columbine. so tell us what you see. in this video. you see, most of all is what looks like a textbook handling of things here and that they start off from the very