A new panic alarm system that was triggered during Wednesday’s deadly shooting at a Georgia high school likely saved countless lives, authorities and advocates for the technology said.

Lockdown warnings flashed on classroom screens at Apalachee High School as gunshots rang out, prompting students and teachers to lock the door, turn off the lights and huddle in the farthest corner from the entrance, witnesses said.

At the same time, alerts automatically went out to law enforcement officers, who responded and ended the shooting rampage within minutes, according to Barrow County Sheriff Jud Smith and Georgia Bureau of Investigation Director Chris Hosey.