Chilling footage has emerged of a Brazilian school shooter calmly setting his sights on victims before his accomplice hacks at their bodies, killing eight.

Guilherme Taucci Monteiro, 17, walks purposefully into the foyer before he pivots round while drawing the revolver from his waistband at the school in the Suzano suburb of Sao Paulo on Wednesday morning.

He fires at the school's principal Marilena Umezu, 59 and then staff member Eliana Xavier, 38, before going on to find others to kill.

The other attacker Luiz Henrique de Castro, who would have turned 26 on Saturday, then enters to hack at the bodies of the fallen with a machete.

The five students killed at the Professor Raul Brasil school were: Caio Oliveira, 15; Claiton Antonio Ribeiro, 17; Douglas Murilo Celestino, 16; Kaio Lucas da Costa Limeira, 15; and Samuel Melquíades Silva de Oliveira, 16.

The injured students were: Adna Bezerra, 16; Anderson Carrilho de Brito, 15; Beatriz Gonçalves, 15; Guilherme Ramos, 14; Leticia Mello, 15; Samuel Silva Felix, 16; Jenifer Silva Cavalcanti; Leonardo Martinez Santos; Leonardo Vinicius Santana; and Murilo Gomes Louro Benite.

José Vitor Ramos Lemos, who turned 18 on March 6, was injured when he was attacked with a machete.

The incident could have turned out worse if not for school attendant Cristina Silva de Moraes' decision to lead 50 students into a kitchen at the cafeteria.

The employees then blocked the entrance with a refrigerator and freezer.

Luiz Henrique de Castro was one of the killer that carried out a deadly attack at a school in Brazil on Wednesday. He would have turned 26 on Saturday

Disturbing footage shows Guilherme Taucci Monteiro, 17, pulling out the .38 caliber pistol on a huddle of victims at the foyer of the Raul Brasil school on Wednesday morning

Monteiro can be seen walking purposefully to the other side of the school's lobby and he has his back to the group

Monteiro can be seen lifting up his hooded pullover to draw the .38 revolver from his waistband as he turns to look at his targets

He raises the firearm towards the group with calm precision as the unsuspecting children prepared for their morning classes

Luiz Henrique de Castro, 25, enters behind his accomplice and viciously hacks at the bodies of the fallen

De Castro moves to another body which lies in an alcove of the foyer as he pounds at it with a machete

De Castro can be seen thumping the bodies with the machete before moving further down the hallway to follow Monteiro

Monteiro posted up to 30 images of himself online holding the pistol allegedly used in the massacre and wearing a skull mask which was reportedly found at the scene

The Prof. Raul Brasil elementary school is located in the eastern suburbs of sprawling Sao Paulo - Brazil's second largest city

The assailants entered with hoods and 'medieval' weapons including knives, a machete and crossbows, as the children had their morning snack break.

Minutes before the attack, Monteiro posted 26 photos on his Facebook page, including several with a gun and one that showed him giving the middle finger as he looked into the camera.

In others he wore a black scarf with a white imprint of a skull and cross bones. No text accompanied the posts.

By Wednesday afternoon, Facebook had taken down Monteiro's page.

During the attack, Monteiro opened fire with a .38 caliber handgun and de Castro used a crossbow, police said.

But before the duo carried out the carnage that left a dark cloud over a country that a week ago was in a festive mood celebrating the Carnival of Brazil, Monteiro visited his uncle's car dealership and shot dead Jorge Antonio de Moraes in his office.

According to Brazilian news outlet G1, witnesses said de Moraes had argued with his nephew Tuesday.

O Globo reported that de Moraes had fired Monteiro from the dealership.

De Moraes was ushered immediately to a local hospital and underwent surgery before later passing away.

Witnesses also added that Monteiro then followed de Castro to the school to carry out their carnage.

Family of Marilena Ferreira Vieira Umezu, one of the victims killed in a shooting at Raul Brasil School, attends a collective funeral in Suzano on Thursday

The mourning family of Eliana Regina de Oliveira Xavier weep beside her coffin at the church in Suzano

Relatives of the deceased put their hands on the victim at her funeral ceremony on Thursday

Hundreds of mourners gathered to pay their last respects to the victims of the mass school shooting

The family of Ms de Oliveira Xavier surround her coffin, as one dressed in a scouts uniform places his hand on the victim

The attackers were also carrying Molotov cocktails, knives and small axes, authorities said.

At least 11, mostly children, were also shot at the elementary school and taken to hospitals.

Distraught parents and pupils held a candlelit vigil on Wednesday evening for the victims.

Luiz Henrique de Castro killed one of the victims with a machete during Wednesday's school attack in Brazil

Guilherme Taucci Monteir allegedly killed his uncle at a used car dealership before heading to the school

An image appears to show one of the attackers with an machete tucked into his waistband lying in a pool of blood after he shot himself dead following the attack

CCTV images show children running for their lives from Professor Raul Brasil State College in the Suzano, Sao Paulo, which has more than 1,600 students from elementary through secondary school grades

The shooting at the Raul Brasil school in Suzano, 60 kilometers from Sao Paulo, was allegedly perpetrated by a teenager and a 25-year-old man who were former students and who later committed suicide

Locals attend a street mass nearby the Raul Brasil public school, following a shooting in which ten people -including the two shooters and five minors- died

Two men light candles during a mass to honor the victims of the massacre, which left 10 dead on Wednesday

Relatives and students react while paying tribute to victims of the shooting in the Raul Brasil school in Suzano, Sao Paulo state. Ten people died including five minors

'In 34 years as a policeman, it's the first time I see someone use a crossbow like that,' police Col. Marcelo Salles said. 'It is horrendous.'

Military Police Sergeant Anderson Camargo was the patrolling the area surrounding the school and was approached by residents who alerted him and his partner about de Moares' being shot at the dealership located three blocks from the school.

Sergeant Camargo and his partner eventually came across the car that had been described by the pedestrians outside the school.

They were the first law enforcement agents to respond to the shooting and witnessed students racing for safety before a pair of Molotov bombs exploded.

Before the school shooting, Monteiro allegedly killed his uncle Jorge Antônio Moraes at the car dealership (pictured above) he owned. The pair reportedly argued on Tuesday

Samuel Melquiades Silva Oliveira was one of the students killed in the massacre

Kaio Lucas da Costa Limeira (left) and Douglas Murilo Celestino (right) are two of the six students killed at the school massacre

'There already were some teenagers running and some bodies already on the ground. We heard the two booms, when we got close to the two [attackers] they were already lying on the ground,' Camargo told reporters.

'When we passed the two [attackers] at the end the corridor where they were, there were two more classrooms with the doors closed. We knocked on the doors. It was difficult for the teenagers to open the door because they were very scared.'

The assailants tried to force their way inside a room at the back of the school where many students were hiding when police arrived. Instead of facing officers, Monteiro shot de Castro in the head and then shot himself, authorities said.

CCTV images captured the moment a white car, believed to be used by the gunmen, pulls up outside the school and one of the assailants gets out.

Moments later, dozens of students are seen running for their lives out of the school gates and cameras behind the school show some pupils jumping over the boundary wall in their desperate bid to escape.

Students gathered outside the school recounted harrowing attacks and seeing several bodies lying in pools of blood.

A youngster is stretchered into the hospital by paramedics in the Suzano suburb of Sao Paulo after he was injured during the shooting at the Professor Raul Brasil school nearby

A powerful hunting composite bow was also recovered from the scene, as bloody footprints are pressed into the concrete

The bomb squad was scrambled to the scene as a bag with a wired up package was left by the assailants (right) as well as what appear to be Molotov cocktails (left)

Distraught students, friends and relatives gathered outside the school gates after attackers opened fire at around 9.30am

A notebook which reads in English 'Can't Run', was found in the vehicle used by Guilherme Taucci Monteiro and Luiz Henrique de Castro, believed to be perpetrators of the massacre

An image purportedly shows one of the attackers with an axe tucked into his waistband and blood spatters the floor around him

The Brazil school attackers also killed 17-year-old Claiton Antonio Ribeiro (pictured)

Kelly Milene Guerra Cardoso, 16, said she and other students took refuge in the school's cafeteria, locked the door and lay on the floor.

'We stayed there until the door was opened. We thought it was the shooters coming to get us, but it was the police,' she said. 'They told us to start running.'

Horacio Pereira Nunes, a retiree whose house is next to the school, said he heard shots around 10am.

'Then a lot of kids started running out, all screaming,' he said. 'It didn't take long until police arrived.'

'A monstrosity and cowardness without equal,' President Jair Bolsonaro wrote in a tweet expressing his sympathies for the families of the victims of Wednesday's attacks.

Monteiro was raised by his maternal grandparents. Despite an eight-year gap in their ages, he maintained a close relationship with de Castro dating back to their childhood.

The 17-year-old killer reportedly dropped out of school because his classmates bullied him over his pimples. He told other youngsters in the neighborhood he stopped attending school because he didn't have any friends.

De Castro, neighbors said, was a quiet person who kept to himself and was often nervous.

He was scheduled to work with his dad Wednesday but called out because he allegedly was sick.

Monteiro and de Castro were inseparable and always dressed alike, wearing dark colored clothing.

They shared a Nazi swastika pendant and always visited a local gaming center where they played video games, including Counter Strike and Call of Duty, first-person shooting games.

Investigators visited the gaming center Wednesday and seized a computer that the friends always used. Officials also visited de Castro's home and took a tablet.

Floral tributes to victims of the shooting at Raul Brasil school are seen in Suzano as a candlelit vigil was held on Wednesday night for the victims

An inconsolable woman holds her relative as they pray for the dead outside the Raul Brasil school

A candlelit vigil was held as the relatives of those killed reeled in agony at the shocking depravity

A tearful family mourns the victims as some of the children were unable to escape the attack

Policemen arrive at the school where a shooting occurred in Suzano city in the metropolitan region of Sao Paulo. At least ten people were killed and 23 injured on Wednesday

Staff members and pupils swarmed outside the school building in the Suzano suburb of Brazil on Wednesday

Police said that the two men wearing face masks entered the school building and started shooting at about 9.30am local time.

Within the school the police found what appeared to be Molotov cocktails and a wired up suitcase.

The bomb-squad were scrambled to the scene as armed officers descended on the school.

The massacre happened in the metropolitan region of Sao Paulo, and is considered one of the worst school tragedies in Brazil

A sobbing woman uses her mobile phone as she waits for news outside the school as five children were confirmed dead

Police officers guard the entrance to the Prof. Raul Brasil school in the Suzano suburb of eastern Sao Paulo after two hooded men killed ten and wounded many more

Firetrucks and ambulance crews were on hand as news that ten people had been killed and many more injured spread from the Prof. Raul Brasil elementary school

A man weeps outside the school walls as he speaks on the phone after learning what has happened within

Police arrived eight minutes after the shooting started and did not confront the gunmen, who had already killed themselves.

A video shot during the shooting and aired by Globo TV showed children screaming, running and begging for their lives as loud shots were heard all around.

Security cameras from homes nearby showed children climbing and jumping over a white wall that surrounds the Raul Brasil building, and sprinting down streets, screaming for help.

Police officers wielding sub-machine guns dash past coaches lined up close to the school in the Suzano suburb

Heavily armed police are seen on the cobbled street outside the school after emergency services were scrambled on Wednesday morning

Policemen walk along the streets around the walls to the school in Suzano, as a firetruck was also on hand as reports of explosives circulated

Relatives are seen outside the school, many were tearful as they waited for news of their loved ones

A plainclothes police officer can be seen with an assault rifle draped over him as he makes a phone call

Policemen stand guard outside the elementary school in the suburbs of Sao Paulo

The building was cut off by emergency crews as students and staff poured onto the street outside, many in tears.

According to Globo, a 15-year-old described the violence: 'There were a lot of dead people on the ground. They shouted, but I did not understand what it was.

'My friend took a stab in the shoulder and another was shot. I ran away with another friend to my house and came back to get another.'

Ambulances could be seen transiting the many wounded victims on Wednesday morning

People could be seen flocking on the street outside the school this morning as TV helicopters swooped overhead

Police officers wearing body armour and holding automatic weapons stand at the entrance to the school

Staff and pupils could be seen pouring out onto the street around the school in the eastern suburbs of Sao Paulo, many were inconsolable

Investigators can be seen working through the school grounds as they looked to secure the location

A policeman can be seen walking through the grounds of the elementary school after the heinous shooting

Two young shooters allegedly opened fire as the school was opening for morning classes - the front of the Prof. Raul Brasil school is seen in this undated photo

In April 2011, a former pupil killed a dozen school children and injured many more before turning his gun on himself at a school in the suburbs of Rio de Janeiro.

Brazil is one of the most violent countries in the world with 64,000 murders in 2017, a rate of almost 31 per 100,000 inhabitants - that's three times higher than the level the United Nations classifies as endemic violence.

Standing outside the school on Wednesday, Claudio Cabral said he had been trying to reach his nephew, 17-year-old Douglas Mourinho, so far without luck.

'He is a smart kid. We heard many students jumped the wall,' Cabral said hopefully. 'Maybe that's what happened.'