Nashville school shooting kills 6; new security footage released killing 3 children and 3 Adults

Warning, surveillance video released by police may be disturbing to watch. Viewer discretion is advised.

Metro Nashville Police Department released surveillance video from the Covenant School that shows the shooter drive up to the parking lot, shoot through the glass entry doors and begin firing inside the building.

Three children and three adults that included the head of the school were killed in the attack. The shooter was killed by police.