On the morning of 7 April 2011, justly on World Health Day, 12 students aged between 13 and 15 years old were killed[4] and 22 others seriously wounded by Wellington Menezes de Oliveira, 23 years old, who entered the Tasso da Silveira Municipal School (Escola Municipal Tasso da Silveira), an elementary school in Realengo on the western fringe of Rio de Janeiro, Brazil.

Police investigations prior to the massacre, via an anonymous report, found that Oliveira had left to buy a 32 caliber revolver with two men, an unemployed watchman and a locksmith, Charleston Souza de Lucena e Izaías de Souza, respectively, and both suspects confessed having been middle-men in the revolver's sale at a nearby kiosk in Sepetiba.

Oliveira entered without asking for permission, calmly, and then took his weapons, one in each hand, and started to shot several pupils, in the boys arms and legs and in the girls heads, looking to only kill them.

She's described as a safe haven to Oliveira and her death worsened his mental illness, already known by his family and with an attempt of treatment with a psychologist, that was abandoned by the young man.

According to former schoolmates he was a strange, very reserved person constantly harassed by others, was called "Sherman" (an allusion to a character from American Pie), as well as "suingue" (swing), because he had a limp leg, and was thrown into a garbage bin.

He has bought two revolvers and a speedloader, and also took shooting classes, having evidence that he planned an action since the previous year, always with the intent of revenge and admiration for other terrorist attacks.

It was later confirmed he felt "inspired" by Cho, going so far as to call him a "brother" and thanking him, along with fellow Brazilian Edmar Freitas, the perpetrator of the 2003 Taiúva school shooting, for their "bravery" and for "leading the way".

[36] The killer's computer was tested to find out with who he electronically corresponded (he had been messaging with a specific person for three months) and the shooting instructor that taught Oliveira was heard by the deputy.

The police didn't have any intentions of recreating the crime in Realengo and a forensic psychologist was tasked with issuing a report about the mental conditions of the shooter.

With scientific rigor, the Realengo killer suffered with some neuropsychiatric disorder with psychopathic traits, combining persecutory ideation, delirium, hallucinations, fantasies and a distorted reality.

In the afternoon of the tragedy, the national media put out that his adoptive sister said that he had connections to Islam, didn't leave the house and "lived on the Internet".

[26] That opens the opportunity to say that it was an "imported tragedy" because it wasn't new in other countries, like the United States, Argentina, Russia e China, but very rare in Brazil.

Adding the religious motivation to the mistreatment during school times, a close friend of Oliveira stated that he "suffered from bullying, was addicted to violent games and terrorist attacks".

[24] Visiting the barber, according to the latter's statement, he said he couldn't shave his long beard that covered his face because he would be kicked out of the group he was a part of and with which he periodically met up with in Rio de Janeiro (the beard, is in fact, part of the Islamic tradition as a symbol of masculinity, reason for pride and object of extra attention, also representing the believers reputation).

[45] That video reinforces the thesis that Oliveira wanted to take revenge for the bullying he suffered in school: "Most people that disrespect me, think I'm an idiot, that take advantage of my kindness, that judge me in advance [...].

[46] On April 15, the authorities shared a video recorded by the killer in which he describes all his preparation for the crime and makes it clear that his motivation were the humiliations suffered at school.

- Wellington Menezes de Oliveira[31]There were a lot of analysis and interpretations by theologian, psychologists and justice experts when the letter was revealed.

[48] By citing the words "purity" and "chastity", enforcing a certain religious sense to them, he asked that his body was washed and wrapped in a white sheet left by him in the school building.

[49] The Federation of Muslim Association of Brazil, in contrast, published a note on the afternoon of the 7th to make clear that the shooter wasn't part of the community.

The theologian Leonardo Boff, for example, talked about the point where the letter's author cites the second coming of Jesus, stating that Oliveira "doesn't connect to the Jewish, Muslim religion, none of that.

The theologian also observed that two concept would be strong within context of the letter: manichaeism and the "conscience of sin", to that he says: "He just wants absolute purity.

[48] Another specialist, Eulálio Avelino Pereira Figueira, coordinator of the specialization course in Religious Science in the Pontifical Catholic University of São Paulo, stated: "There's no religion that is founded on gratuitous evil, much less on the perversion and the cruelty.

[48] According to a forensic psychologist and writer of the Estadão, Daniel Martins de Barros, it's not unlikely that Oliveira has a personality disorder, but that on itself wouldn't explain the crime, going back to the concept of catathymic crisis to understand what happened.

Cabral classified the shooter as a "psychopath and animal" and described the sergeant, teachers and children from the elementary school, who were able to call policemen who were nearby, as "heroes".

[58] Many virtual communities on the social media Orkut were created to glorify the crime and its author, defending his actions and inciting people to do the same.

The criminalists expressed their concern and announced that the Public Prosecutor can frame these virtual environments in the repression laws to racism crimes and the kind.

[59] The incident sparked nationwide discussions about how safe Brazilian schools are, and the government promised to advance a disarmament program from 6 May 2011, until the end of the year.

[63] At the end of a concert in São Paulo, singer Bono, from Irish band U2, asked almost 80 thousand people to remember the children who died in Realengo while their names scrolled up on a screen.

The British websites The Guardian, The Daily Telegraph and BBC; the North-American CNN, MSNBC, The New York Times, Al Jazeera, the Spanish El País, the Portuguese RTP and the Argentinian Clarín highlighted the topic.

[68] The archbishop of Rio de Janeiro, Orani João Tempesta, received a letter from Pope Benedict XVI, who said that he prayed for the quick recovery of the wounded and asked all people of the city to "help build a society with no violence, and respect for each other, especially for the weak and oppressed".