Footage of the shooter breaking in the Nashville Elementary School

The former student of a Christian grade school in Nashville who killed three 9-year-olds and three adults in a shooting spree there was under a doctor's care for an "emotional disorder" and had amassed a collection of guns

Metropolitan Nashville Police Department said they first received calls about the shooter — identified by authorities as 28-year-old Audrey Hale — at around 10:13 a.m. local time. When authorities arrived on the scene, they could hear shots ringing out from the second floor of the school.