In addition to the five kids, one adult who worked at the Professor Raul Brasil school in Suzano, on the outskirts of São Paulo, was killed as well as a person standing outside the building.
Sao Paulo state authorities say eight people have been killed in a school shooting in Brazil, including two student shooters. - A shooting at a school near Sao Paulo on Wednesday left several people dead, police sources said, with initial reports putting the death toll as high as ten, including two shooters.
The school located in Suzano, 50km from São Paulo, has around 1,000 primary and secondary students, aged between 11 and 15.
At least 17 other people, mostly children, were also shot and taken to hospital, police said in a written statement.
Two armed men wearing face masks entered a Brazilian elementary school Wednesday and shot and killed at least six children who were on their snack breaks, as well as two school officials, before fatally turning their guns on themselves, police said.
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The attackers appeared to be in their early to mid-20s, and authorities don't believe they were former students, the governor said.
Latin America's largest nation has the largest number of annual homicides in the world, but school shootings are rare.
"I was shocked with the scenes I saw inside that school", Doria said.
Gun laws have been extremely strict in Brazil since 2003 when former leftist President Luiz Inacio Lula de Silva signed measures that prevented ordinary citizens from carrying guns.
Another shooting that took place about 500 metres from the school happened before the killings, but it was not yet clear if the two incidents were linked.