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Investigators were reviewing video and reading the writings of a 15-year-old boy on Wednesday as they sought clues to what drove him to go on a deadly shooting spree at his high school north of Detroit, where he killed three fellow classmates.

The suspect, whose name was withheld by officials because he is a minor, opened fire on Tuesday with a handgun his father had purchased four days earlier, killing three students.

Tate Myre, 16, died in a patrol car en route to a hospital. Hanna St. Julian, 14 and Madisyn Baldwin, 17, were also killed in the shooting. A teacher and seven other students were wounded, some critically, authorities said.

By Wednesday morning, more than 50,000 people had signed an online petition to rename the school's stadium after Myre, who was a member of Oxford High's football team, saying he tried to disarm the shooter. "Tate is not just a hero to his fellow students at Oxford high school but a legend, his act of bravery should be remembered forever and passed down through generations."

Oakland County Sheriff Michael Bouchard said in an interview on CNN on Wednesday that it was clear that the shooter intended to kill people. "He was shooting people at close range, oftentimes towards the head and chest. ... It's just absolutely coldhearted murders," he said, adding that the shooter fired at least 30 shots. "We can't get the motive from the suspect that we have in custody, but we think we've got a path to get a lot of supportive information as to how and why this occurred," he said.

The shooter was armed with a 9mm semi-automatic handgun his father had purchased on Nov. 26, along with three 15-round magazines. Seven live rounds remained in the gun when the youth was arrested, the sheriff said late on Tuesday.

The suspect was disarmed and taken into custody by sheriff's deputies minutes after the shooting began. He declined to speak with investigators after his parents retained a lawyer and denied authorities permission to interview their son, Bouchard said. "The person who's got the most insight on motive is not talking," the sheriff said.

Bouchard said he was unaware of any previous run-ins with law enforcement by the suspect, a high school sophomore, adding that investigators had so far seen nothing to suggest a history of disciplinary problems or threats. He said forensic technicians were collecting evidence from the crime scene, while detectives began collecting video footage from security cameras mounted around the school and interviewing witnesses and those acquainted with the suspect. The sheriff said a search warrant was executed at the suspect's home in Oxford and his cellphone was seized.

Bouchard credited swift action by his deputies for preventing greater loss of life, saying they arrived on the scene within minutes and moved straight toward the sound of gunshots. Officers confronted the young assailant advancing down a hallway toward them with a loaded weapon, and he put his hands over his head and surrendered, Bouchard said. The precise sequence of events during the violence remained unclear, but police believe the student carried the weapon into school in a backpack, the sheriff said.

The boy, who was unharmed, was being detained in a special cell under suicide watch at a juvenile detention center, Oakland County Executive David Coulter said.

Of the seven other students struck by gunfire, three of them - a 15-year-old boy with a gunshot wound to the head and two girls with chest wounds, aged 14 and 17 - were hospitalized in critical condition, Bouchard said. The younger girl was on a ventilator after surgery. The four remaining teenage victims - three boys and a girl - were listed in serious or stable condition. One teacher was treated for a shoulder wound and later discharged.

The boy apparently "had been shooting" the gun before Tuesday's attack and had posted pictures of the weapon and a target he was using, according to the sheriff.

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'How does he still have a job?' CNN staff sounds off as Chris Cuomo defies ban, talks bro on SiriusXM show

Chris Cuomo on Tuesday used his SiriusXM show to speak about his brother's resignation as governor of New York despite being banned from discussing it on CNN — which is weighing his future as a network host amid calls for his ouster.

About 35 minutes into his two-hour SiriusXM show, Chris Cuomo went on a rant in which he blamed his brother's disgraceful exit on vast conspiracy spanning both sides of the political spectrum and the news media, saying that "the game has rules."

Some of the remarks echoed those previously made by Andrew Cuomo, who quit in August facing all but sure impeachment after James issued a report that accused him of sexually harassing 11 women, including nine current or former state employees.

They also flew in the face of CNN's statement in May that Chris Cuomo wasn't covering Andrew Cuomo's scandal for the network because "he could never be objective" and "often serves as a sounding board for his brother."

Meanwhile, CNN employees told The Post that the network needed to finally fire Chris Cuomo, who's repeatedly come under fire for advising his brother off-camera and stayed silent regarding Monday's revelations during his show that night.

"How does he still have a job at the network? He's not a journalist," one staffer said.

"'Cuomo Prime Time' has the lowest ratings to date. The viewers no longer trust him. His reign at CNN has to end."

Another said, "Chris Cuomo enabled a sexual predator, the former governor of New York. He needs to immediately resign or CNN must fire him.

"Does Chris Cuomo have any journalistic integrity? No."

Elisa Batista of the women's rights group UltraViolet also said Chris Cuomo "should be fired immediately" for "using his position at CNN to seek information on the accusers."

"This a severe breach of journalistic ethics," Batista said in a prepared statement.

"CNN should immediately sever ties with Chris Cuomo. Anything less is unacceptable, and further harms survivors of sexual abuse."

CNN didn't immediately return requests for comment, but on Monday said it was reviewing the documents released by James to determine "their significance as they relate to CNN."

The network also said it expected to come to a decision within "the next several days."

CNN "indefinitely" suspended host Chris Cuomo on Tuesday over his secret role in trying to defend his brother, then-Gov. Andrew Cuomo, from the sexual harassment allegations that forced him from office — and for using his journalistic resources to aid that effort.

The move came a day after state Attorney General Letitia James released a trove of subpoenaed records that include texts showing the Cuomo Prime Time star agreed to contact news industry "sources" for advance information on damaging reports regarding his older brother.

CNN previously stood by the anchor of its weekday 9 p.m. show following a May report by the Washington Post that revealed he took part in behind-the-scenes strategy sessions with his brother's top aides and advisers.

But calls for Chris Cuomo, 51, to be fired intensified after the newly released evidence laid bare the extent of his dual role as network anchor and gubernatorial adviser, with even fellow CNN employees telling The Post earlier Tuesday that he needed to go.

The text messages made public by James show Chris Cuomo communicating with his brother's then-top adviser, Melissa DeRosa, on March 7 regarding a rumor that additional accusers would be coming forward the next day.

Other damning testimony revealed how he and his big brother discussed COVID-19 "messaging," political campaigning, the #MeToo movement and then-President Donald Trump — all topics that Chris Cuomo regularly spoke about during his CNN show.