A discarded handgun lays in the doorway of classroom 10, where Adam Lanza's deadly rampage in Sandy Hook elementary school finally came to an end.

The photo of the doorway was part of several images and heartbreaking 911 calls made public today as Newtown Police released their full report into the massacre.

The police file, which runs to 7,000 pages, vividly illustrates the terror that came to the Connecticut community a year ago this month.

He began to lift the children out in the hopes that some may still be alive but 'as he got to the last bodies it was clear that no one had survived'.

The aftermath was so horrific that paramedics were warned 'This will be the worst day of your life' as the prepared to enter the school.

Harrowing accounts from children who survived the shooting are also contained in the filed.

In one, a boy sits down with his parents and a police officer at the Newtown Police station and says that he saw 'everything'.

The child says that a 'bad man' suddenly came into their class wearing 'army clothes' and firing a ‘bazooka’. He saw his teacher get shot and knew she was dead. 

Lanza fired at the boy multiple times but missed by inches and hit something he was holding in his hand.

The boy dropped the stuffed animal he was holding in his other hand and ‘ran, and ran, and ran’ out of the school, past the bloodied body of principal Dawn Hochsprung.

A second pupil recounted to police how he heard loud noises outside his classroom that he thought were a hammer.

The door ‘banged open’ and Lanza, who the boy describes as tall and skinny, shot somebody in the classroom dead and she ‘fell down’.

Everyone was screaming and ran out of the classroom after Lanza apparently moved on to kill others.

In the first grade classroom of teacher Lauren Rousseau only one girl survived out of 15 pupils, plus Miss Rousseau.

When police came into the room the six-year-old told them: ‘I’m scared and I want to go home.'

The released evidence included the emergency calls made by teachers as they called for help during the 11-minute rampage.

In one of the 911 calls a teacher is heard whimpering as she says: 'I'm bleeding, I'm in the Kindergarten room.'

The unnamed woman says that she has been shot in the foot and nearly breaks down in tears when she can hear shooter Lanza walking past.

Between anxious, deep breaths she says: 'My God, he's still shooting. Whoever he is, he's still shooting.'

The recordings were made public after the Newtown Police Department revealed its full report into the mass slaughter, which left 20 schoolchildren and six teachers dead.

Lanza, 20, blasted himself to death after the massacre in which he also killed his mother Nancy, 56.

By far the most emotive parts are the 911 recordings, even though the names of the people involved have been beeped out.

The unnamed woman calls 911 with a group of five-year-old children around her, who do not make a sound as she talks under her breath.

She says: 'I at Sandy Hook school, there’s somebody shooting guns. I’m bleeding, my foot’s bleeding. I’m in the Kindergarten room.'

The woman is told by the 911 dispatcher to lie on the floor and says she is unable to lock her door.

She says: 'He's out in the hallway, whomever it is ... He keeps firing. Oh gosh I hear shooting! 

'Oh my God, just shooting, whoever it is is just shooting.'

A large section is beeped out in which it is thought gunfire is clearly audible.

In another recording another woman anxiously tells police that she has a classroom full of 16 pupils and has locked the door.

She sounds on the edge of panic and says: 'I need assistance urgently, I’m in a classroom with kids. I can’t see anyone. The door is locked. The sound is still going on.'

Another woman at Sandy Hook calls 911 and tells police: 'There’s something going on at our school. We hear something over the loudspeaking, it sounds like a loud popping noise.'

Asked if it sounds like a gun, she says: 'Yes, I think so.'

The Newtown police file also shows up moments of heroism and chaos. A police officer found one of the teacher's bodies slumped over pupils in an attempt to protect them.

Teachers insisted that police put their badges under the door before they opened it up because so they were so scared that Lanza was still out there.

One officer described how there as a ‘massive pile of bodies’ in the bathroom of one of the classrooms which he counted as a total of 15 pupils and teachers.

A witness saw Lanza, wearing a hat and sunglasses, enter the school hallway and begin shooting.

When police arrived at the school and found Lanza's body, they tried to get a response and asked who had shot him, according to the Hartford Courant.

Officers who saw the 20-year-old's body said: 'He appeared to have the body size of a 12-year-old.'

The release of the tapes was met with controversy, with some parents asking for them not to be made public.

Among those who had campaigned for them to stay private was Nicole Hockley, who son Dylan, six, died. 

She said they were 'not in anybody’s interest' and not how she wants to remember her son.

The prosecutor in charge of the Newtown investigation, State's Attorney Stephen Sedensky, also argued that releasing the tapes could prove painful to the victims' families, hurt the investigation, subject witnesses to harassment and violate the rights of survivors who deserve special protection as victims of child abuse.

Despite their efforts, six 911 tapes had already been released by the Danbury State Attorney General in a summary of the police report that was released today.

In them Lanza can clearly be heard opening fire as he walked through the classrooms, shooting the pupils along with six of their teachers.

Rick Thorne, the school’s janitor, tells the dispatcher in a panicked voice: 'I keep hearing shooting - I keep hearing popping.'

He also says: 'There’s still shooting going on! Please!'

The first call, which lasted 24 seconds, was from school secretary Barbara Halstead who said: 'I think there's somebody shooting in here in Sandy Hook School.'

Asked why she thinks that, she says: 'Somebody's got a gun I saw a glimpse of somebody running down the hallway, they're still around me there's still shooting. Sandy Hook please.'

Descriptions from the first officers to arrive at the school revealed harrowing details, including the sight of a teacher's body covering the children they had tried to shied.

An officer who helped bring surviving children to safety told them 'to cover their eyes' and one of the first officers to arrive on the scene feared being ambushed.