Speaker 1: A deadly high school shooting in the Nashville area. Students barricading themselves in classrooms. The horror playing out in Antioch High School. Heavily armed officers rushing to the school. Tonight, the harrowing images from inside the school. ABC's Alex Perez on the scene for us.

Speaker 2: Tonight, this is the terrifying moment inside a Nashville area high school cafeteria, seen in a video posted on Citizen App, when police say 17-year-old student Solomon Henderson opened fire with a pistol, killing 16-year-old Jocelyn Escalante.

Speaker 3: They entered into the cafeteria, firing multiple rounds in the cafeteria, striking her, and then before pulling the weapon on himself.

Speaker 2: Another male student was grazed by a bullet. Just after 11 AM, SWAT teams are swarming Antioch High School with nearly 2,000 students inside.

Speaker 4: All of a sudden, we was hearing, oh, there's a shooting. And everybody was just panicking.

Speaker 2: Frantic students barricading themselves in classrooms.

Speaker 4: We had tables, desks, chairs. We had the method where you put a chair inside the door where you lock it down.

Speaker 2: Family and friends flooded with texts from students inside.

Speaker 3: He was sitting at a table right next to the shooter. And when the shooter brought out his gun, he would start waving it at the students before he shot the two students.

Speaker 2: Outside, a massive crowd of parents desperate to reunite with their children.

Speaker 4: My son is not going here no more. No. This is devastating. And they won't even let me go get him.

Speaker 5: I mean, just chaos. Chaos. Complete chaos.

Speaker 2: And David, police now combing through the shooter's online activity, looking for a motive, and also working to determine if he may have been motivated by other shootings or extremists.

Speaker 1: David? Alex Prez reporting in tonight. Thank you, Alex.