Authorities were set to release surveillance video Thursday showing what happened outside Marjory Stoneman Douglas High School during the Valentine's Day massacre that killed 17 people.

A Florida judge earlier this week agreed with news outlets including The Associated Press that the video should be released. Barring any last-minute appeals, the release is set for noon Thursday.

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FILE- This Feb. 15, 2018 file photo provided by the Broward County Jail shows Nikolas Cruz. Florida prosecutors announced Tuesday, March 13 that they will seek the death penalty against Cruz, a suspect in the fatal shooting of 17 people at Marjory Stoneman Douglas High School.(Broward County Jail via AP, File)

Authorities were set to release surveillance video Thursday showing what happened outside Marjory Stoneman Douglas High School during the Valentine's Day massacre that killed 17 people.

Nikolas Cruz is lead into the courtroom before being arraigned at the Broward County Courthouse in Fort Lauderdale, Fla., on Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Police and school officials had resisted the release, saying it was evidence in an active investigation. Video of what happened inside the school is not being released.

Nikolas Cruz is lead out of the courtroom after an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Cruz said nothing during a brief hearing. Because he refused to announce his plea, Circuit Judge Elizabeth Scherer entered a not guilty plea on his behalf — mainly to keep the legal process moving.

Family and friends of victims watch as Nikolas Cruz is lead into of the courtroom for an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

In the recordings, students and dispatchers were uncertain about the shooter's location and how to hide from him.

David Wilford, left, who's daughter Maddy Wilford was shot multiple times, and Fred Guttenberg, center, who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, enter the courtroom before an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

A teacher from room 1216 also called for help and told the 911 operator that a student had been hit in the chest, and wasn't breathing.

Fred Guttenberg who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, watches Nikolas Cruz enter the courtroom before an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

The police radio recordings showed that the Coral Springs police officers were the first to enter the school building after confirming that Broward County Sheriff's Office deputies had not gone in.

Family and friends of victims hold hands as they watch an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

They warned that the suspect may have changed clothes after they reported finding a camouflaged jacket, ski mask and backpack on the first floor.

FILE- This Feb. 15, 2018 file photo provided by the Broward County Jail shows Nikolas Cruz. Florida prosecutors announced Tuesday, March 13 that they will seek the death penalty against Cruz, a suspect in the fatal shooting of 17 people at Marjory Stoneman Douglas High School.(Broward County Jail via AP, File)

FILE- This Feb. 15, 2018 file photo provided by the Broward County Jail shows Nikolas Cruz. Florida prosecutors announced Tuesday, March 13 that they will seek the death penalty against Cruz, a suspect in the fatal shooting of 17 people at Marjory Stoneman Douglas High School.(Broward County Jail via AP, File)

Police and school officials had resisted the release, saying it was evidence in an active investigation. Video of what happened inside the school is not being released.

Authorities say the video from outside the school depicts actions during the shooting by former deputy Scot Peterson, who was armed and assigned to the school but did not enter the targeted building during the shooting. Broward County Sheriff Scott Israel said Peterson was suspended without pay, and chose to resign.

Nineteen-year-old Nikolas Cruz faces 34 murder and attempted murder charges in the attack. He appeared in court Wednesday as students across the nation walked out of school to protest gun violence.

Nikolas Cruz is lead into the courtroom before being arraigned at the Broward County Courthouse in Fort Lauderdale, Fla., on Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Nikolas Cruz is lead into the courtroom before being arraigned at the Broward County Courthouse in Fort Lauderdale, Fla., on Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Cruz said nothing during a brief hearing. Because he refused to announce his plea, Circuit Judge Elizabeth Scherer entered a not guilty plea on his behalf — mainly to keep the legal process moving.

His attorney, Assistant Public Defender Melisa McNeill, reiterated that Cruz would plead guilty if prosecutors waived the death penalty, which they refused to do.

While Cruz sat in the courtroom, more details of the shooting emerged as the Coral Springs Police Department released recordings of 911 calls and police radio traffic.

Nikolas Cruz is lead out of the courtroom after an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Nikolas Cruz is lead out of the courtroom after an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

In the recordings, students and dispatchers were uncertain about the shooter's location and how to hide from him.

Some were frightened the gunman would return to their location when asked if they could perform CPR on the wounded.

"Please, please, please, there are people here. They are bleeding. They are all going to die," a teenage girl calling from classroom 1216 said through tears and heavy breathing. "There's a lot of people around us that are injured, people that are injured, people that are bleeding. He is upstairs now."

Family and friends of victims watch as Nikolas Cruz is lead into of the courtroom for an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Family and friends of victims watch as Nikolas Cruz is lead into of the courtroom for an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

A teacher from room 1216 also called for help and told the 911 operator that a student had been hit in the chest, and wasn't breathing.

"He's twitching. There's blood all over," she said.

David Wilford, left, who's daughter Maddy Wilford was shot multiple times, and Fred Guttenberg, center, who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, enter the courtroom before an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

David Wilford, left, who's daughter Maddy Wilford was shot multiple times, and Fred Guttenberg, center, who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, enter the courtroom before an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

The police radio recordings showed that the Coral Springs police officers were the first to enter the school building after confirming that Broward County Sheriff's Office deputies had not gone in.

As they cleared each of the building's three floors, the officers described seeing shell casings on the floor and bullet holes in the windows.

Fred Guttenberg who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, watches Nikolas Cruz enter the courtroom before an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Fred Guttenberg who's daughter Jaime was one of 17 people shot and killed at Marjory Stoneman Douglas High School, watches Nikolas Cruz enter the courtroom before an arraignment hearing at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

They warned that the suspect may have changed clothes after they reported finding a camouflaged jacket, ski mask and backpack on the first floor.

On the third floor, officers said they found an AR-15 with a magazine still attached.

Family and friends of victims hold hands as they watch an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

Family and friends of victims hold hands as they watch an arraignment hearing for Nikolas Cruz at the Broward County Courthouse in Fort Lauderdale, Fla., Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 people. (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

The officers found wounded victims and bodies, and they prioritized evacuating the wounded before allowing other students and teachers to leave. On the third floor, they said they shattered windows in some locked classroom doors because terrified students would not open doors.

Cruz was arrested a few blocks away from the school.