A chilling photo of a heavily armed little boy was seized from the home of Newtown school shooter Adam Lanza after the December 2012 massacre – a disturbing symbol of the gun-crazy home where he lived.

Cops did not identify the child pictured in camouflage, draped in ammo, with a handgun near his mouth and a grenade in his lap, but a lawyer for the gunman’s father told The Post the photo was not of Adam.

The image was released along with more than 7,000 pages of photos, videos and documents by Connecticut authorities Friday afternoon.

Lanza, 20, lived in the home with his mom, Nancy — the first of his 27 victims on Dec. 14, 2012 — who kept the place stocked with weapons and violent video games. She had frequently taken him out for target practice.

Other evidence revealed that his father, Peter, also encouraged Adam’s obsession with guns.

A birthday card Peter sent to his son read: “Adam, Happy Birthday. Send me an email when you want to go hiking or shooting. Love, Dad.”

Michael English, Peter’s lawyer, would not identify the child in the macabre photo.

Authorities said the sweeping report concludes the police investigation into the massacre at Sandy Hook Elementary School, where 20 kids and six staffers were killed.

There was still no explanation of Adam’s motive.

But the documents provide new details about the shooting.

Faced with scenes of horrifying carnage, cops handpicked which medics they believed could handle the gore.

“This will be the worst day of your life,” Police Sgt. William Cario warned one, according to the documents.

The paperwork also described Lanza’s lack of mercy.

About 15 people crammed into a restroom for safety, but it was so packed that they could not close the door.

Lanza gunned them all down, said Police Lt. Christopher Vanghele.

The documents also show how brave teachers protected their students while the school’s temporary janitor confronted the gunman.

Teachers heard the custodian, Rick Thorn, try to get Lanza to leave the school.

“Put the gun down!” he yelled.

An aide said that she heard gunfire and that Thorn told her to close her door.

Thorn then called 911 — and gunshots could be heard in the background as he told cops of the horror unfolding inside the small, suburban school.

“My God, he’s still shooting. Whoever he is, he’s still shooting,” said an unidentified, wounded teacher, according to the documents.

One girl who survived the shooting told police, she “didn’t want to die so she ran the fastest she could,” the Connecticut Post reported.

Another teacher told cops how she rushed her students into the classroom’s restroom once she heard “rapid-fire shooting.”

The teacher heard a voice say, “Oh, please, no. Please, no,” and later refused to open the door even when police slid their badges under it.

A drawing taken from Adam Lanza's house. Connecticut State Police A drawing that seems to show a teacher being forced out of a building with the words, "You are now not a teacher no more!" Connecticut State Police Paper targets. Connecticut State Police A baby holding guns in a photo retrieved from the suspect's home. Connecticut State Police What the evidence report describes as "books seized from second floor bedroom" in the house where Adam Lanza lived with his mother in Newtown. AP/Connecticut State Police Evidence photo showing a birthday card for Adam Lanza. Connecticut State Police Evidence photo from Adam Lanza's house. Connecticut State Police Evidence photo from Adam Lanza's house. Connecticut State Police A samurai sword is pictured in the Lanza home in Newtown. Connecticut State Police Evidence photo from Adam Lanza's house. Connecticut State Police Evidence photo from Adam Lanza's house. Connecticut State Police "Left 4 Dead," another first-person shooting game, and other titles were also found at the Lanza home. AP Ultra-violent video game titles like "Gears of War" and first-person shooter "Call of Duty: Modern Warfare" were found at Lanza's home. AP Video game consoles in Lanza's room AP AP Shotgun shells and rounds, and a holster at the base of the locker AP A gun locker at Lanza's home A drawer filled with magazines was found at Lanza's house. Getty This rifle was found in the master bedroom of Lanza's house. Lanza's Newtown Technology Team ID was found in the bathroom at his house. Getty The plastic-covered windows in Lanza's bedroom. Getty Police tape surrounds Sandy Hook on the day of the massacre. AP The car Adam Lanza drove to the school. Getty Another view of the Bushmaster rifle used in the deadly school shooting, with magazine AP Magazines and rounds found at the shooting scene. AP Bullet strikes to car in the school's parking lot. A bullet casing at Sandy Hook Elementary School. Getty Crazed gunman Adam Lanza brought even more weapons than the ones he used in the killings. This a shotgun was found in the trunk of the shooter's car. Getty This Bushmaster rifle used in the killing spree was found near the shooter's body in Room 10. Getty This Glock 10mm was found near the shooter's body in Room 10. Getty A a Sig Sauer P226 9mm found on Adam Lanza's body after he killed himself. Getty This arsenal was found either on Adam Lanza or near his body. Getty This window in the front of the building was shot out. Getty Bullet holes can be seen in windows at Sandy Hook Elementary School in Newtown, Connecticut. Connecticut State Police Damage done to the front entrance of the school. Getty Connecticut officials Monday released these chilling evidence photos taken of Sandy Hook Elementary School after a gunman massacred 20 kids and 6 adults last year. These windows in the front of the building were shot out in the rampage. Getty Ad Up Next Close Clowe finally cleared to return to Devils lineup As Ryane Clowe celebrated Christmas back in his native Newfoundland,... 38 View Slideshow Back Continue Share this: Facebook

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The documents also included descriptions of the moments when police told anxious parents that their children were among the victims of the nightmare.

One report detailed how cops returned a black Guess jacket to the family of hero teacher Victoria Soto, who died protecting her first-graders.

Other pictures showed the killer’s arsenal of guns and exotic knives, including three samurai swords.

The weapon he used to kill his mother in her sleep was found on the master-bedroom floor alongside a book titled “Train Your Brain to Get Happy.”

One of Lanza’s former teachers told investigators that Adam exhibited antisocial behavior, rarely interacted with other students and obsessed in writings “about battles, destruction and war.”

“In all my years of experience, I have known (redacted) grade boys to talk about things like this, but Adam’s level of violence was disturbing,” the teacher said. “Adam’s creative writing was so graphic that it could not be shared.”

The report says Lanza was diagnosed with autism in 2006 and that he constantly washed his hands and changed his socks up to 20 times a day.

Lanza’s mother declined to give him antidepressant and anti¬-anxiety medication because she thought it made it difficult for him to raise his arm.

And about two weeks before the massacre, Nancy Lanza told a friend that Adam was increasingly despondent and that he had gone “over the edge” when their house lost power during Hurricane Sandy.

The report also quotes a witness whose name is redacted as saying Adam had a grudge against the school.

“Lanza hated his mother and Sandy Hook,” the witness said.

He had also downloaded videos about Columbine HS killers Eric Harris and Dylan Klebold.

His obsession with murder dated at least to fifth grade, when he wrote the homemade “Big Book of Granny,” in which a character has a gun concealed in her cane that she uses to shoot people, while another character likes hurting people — especially children.

Lanza shot his way into Sandy Hook Elementary at 9:30 a.m. armed with a Bushmaster semiautomatic assault rifle and a Glock 10mm handgun, which he used to commit suicide about five minutes after the carnage began.