Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - "This is a student at Sparks Middle School. Can you please send police out here? There's a kid with a gun."
"Somebody brought a gun to school. They shot a teacher."
"I got a kid down who's been shot."
As police tried to piece together how and why a seventh-grader shot and killed a teacher and wounded two other students at his Nevada school, recordings of the first calls to police captured the horror and chaos he unleashed.