According to local media, a young individual burst into the school and began firing. The shooter surrendered to the police after carrying out the attack.
The Sao Paulo Public Safety Secretariat stated that the injured people were transported to a hospital but did not provide the exact number of victims or details regarding their conditions.
"A 15-year-old student entered the school with a gun and fired shots... The victim who did not survive his injuries was shot in the head," local outlet G1 reported.
A Polícia Militar atende uma ocorrência de disparo de arma de fogo dentro de uma escola estadual em Sapopemba, na Zona Leste de São Paulo, na manhã desta segunda-feira (23). De acordo com a polícia, três pessoas ficaram feridas.
The text reads, "The Military Police responds to an incident with firearm shots inside a public school in Sapopemba, in the eastern zone of Sao Paulo, on the morning of Monday the 23rd. According to the police, three people were wounds."
"Two other people were injured in the chest and collarbone. A fourth student was injured while trying to escape during the attack," it added.
So far this year, there have been eight school attacks, accounting for one-third of the cases recorded in Brazil since 2002, according to the Brazilian Public Security Forum.
The most recent attack occurred in June at a school in the state of Paraná, where a teenage couple lost their lives, and the attacker was found dead two days later, apparently by suicide.