Video footage taken at Apalachee High School in Winder, Georgia, after Wednesday’s mass shooting shows a sense of calm amid the chaos.

Sophomore Alexsandra Romero, 15, was sitting in a classroom with classmates when she saw footage of police officers entering the room and directing them out through a hallway.

“Single file line down this gang right here after this deputy,” an officer can be heard saying. “Hurry up, come on, let’s go. We got to evacuate a whole school, people, come on now.”

Romero told The Atlanta Journal-Constitution she believed it was a training exercise.

GEORGIA HIGH SCHOOL SHOOTING: 4 DEAD, 1 SUSPECT IN ARREST, AUTHORITIES SAY

On September 4, 2024, an officer is seen escorting students out of a classroom at Apalachee High School in Winder, Georgia. (Alexsandra Romero/Joel Romero via Storyful)

“I remember my hands were shaking,” Romero said. “I felt bad because everyone was crying, everyone was trying to find their brothers and sisters.”

Another video, taken by the teenager as she left the school, shows a body covered in a sheet, surrounded by blood, and firearms lying on the floor.

WHO IS THE ALLEGED GEORGIA SCHOOL SHOOTER? WHAT WE KNOW

Authorities identified the four victims who died: two teachers and two students.

Georgia Bureau of Investigation Director Chris Hosey identified the teachers as Richard Aspinwall and Christina Irmie, both math teachers, and the students as Mason Schermerhorn and Christian Angulo, both 14.

Nine others were taken to various hospitals with gunshot wounds.

Students walk through a hallway at Apalachee High School in Winder, Georgia, on Wednesday following a mass shooting. (Alexsandra Romero/Joel Romero via Storyful)

On Wednesday, authorities identified Colt Gray, now 14, as the suspected shooter. Gray surrendered to authorities and was taken into custody after the shooting.

Gray had been on the FBI’s radar as a potential threat since last year, the agency confirmed.

CLICK HERE TO GET THE FOX NEWS APP

“At that time, there was no probable cause for an arrest or to take additional law enforcement action at the local, state, or federal level,” the FBI said.

Stepheny Price, Gabriele Regalbuto and Louis Casiano of Fox News contributed to this report.