After a bitter battle, Connecticut authorities finally released the 911 tapes from the Sandy Hook Elementary School shooting.
The dispatches released Wednesday reveal the crime scene from the moment gunman Adam Lanza shot his way into the school to the moment the police arrive.
"I caught a glimpse of somebody. They're running down the hallway," one woman says, her voice shaking as she gives the dispatcher her account. "They're still running and still shooting."
The audio paints a horrifying scene as teachers corral students into their classrooms, lock the doors and tend to gunshot wounds.
"It sounds like there are gunshots in the hallway," one teacher says.
The dispatcher instructs her to lock down the school and keep her students away from the window.
"We are trying," she responds calmly.
Lanza murdered 20 children and six school officials on Dec. 14, 2012, before turning the gun on himself.
Police estimate he killed 26 people with a semi-automatic weapon in less than 11 minutes.
As the shooting was unfolding, Rick Thorne, a custodian at the school,, described the scene to a dispatcher.
"I believe there is shooting at the front glass. Something is going on," he said. "The front glass is all shot out...it is still happening."
From the beginning, dispatchers calmly inquired about the classrooms closest to the entrance of the school.
"I keep hearing popping," Thorne said ominously.
The 911 tapes were released just a little more than a week after the Connecticut state attorney's office released a frightening report detailing the isolated and disturbing life Lanza lived in the days before the massacre. The release comes barely a week before the one-year anniversary of the shooting, which sparked a national debate about gun control.
Many of the victims' families and school officials fought in court to keep authorities from releasing the tapes, arguing their release would inflict more pain on the community.
"If the tapes are released, I will never know when I may be confronted with the sound of myself or my colleagues calling for help," Shari Burton, a teaching assistant at Sandy Hook who called 911 that day, testified, according to the Los Angeles Times. "There is nothing to be gained, no arrest to be made."
After a lengthy court battle, a state judge ultimately ruled that the public had a right to know.
"Delaying the release of the audio recordings, particularly where the legal justification to keep them confidential is lacking, only serves to fuel speculation about and undermine confidence in our law enforcement officials," New Britain Superior Court Judge Eliot Prescott told the Associated Press.