The attack took place in Sapopemba, a neighborhood on the eastern side of Sao Paulo and the perpetrator has been arrested, Reuters reported citing the Brazilian local government.
"The Sao Paulo government deeply regrets and sympathizes with the families of the victims of the attack that took place on Monday morning at Sapopemba State School," a statement from the local government said.
According to the government, three students were shot and one of them - a girl - died, while the other two were hospitalized. A fourth student was injured while trying to flee the attack.
In March, a student with a knife killed a teacher at a school in another Sao Paulo neighborhood in an attack that injured three teachers and a student.
AMK/PR