Tennessee police have released disturbing surveillance video from the school where a mass shooting occurred on March 27.
The video shows the suspect, identified as 28-year-old Audrey Hale, shooting through a side door before entering the building heavily armed.
Hale went on a rampage, killing six people, including three nine-year-old children.
Police say she was a former student at the school and that the shooting was well planned.
Multiple rounds of ammunition, two assault rifles, and a handgun were found at the scene.
The shooting lasted just 14 minutes before Hale was killed by police.
The motive for the shooting remains unclear, though authorities have a manifesto, writings, and a map of the plan.
Among the victims was Dr.
Catherine Kuntz, the head of the Covenant School, who died protecting the children she loved.
The tight-knit Christian community is in shock, with some parents expressing their frustration at failing their children.
