Two assailants opened fire Wednesday in a school near Sao Paulo, Brazil, killing eight people and wounding 15 others, state military police said.
Authorities said five students and an administrator at the school were killed.
Despite Brazil being one of the world's most violent countries, school shootings are rare.
Far-right President Jair Bolsonaro, who took office in January, has signed a decree making it easier for law-abiding citizens to own a gun, a key campaign promise, even though many restrictions remain in place.
"When I arrived at the school.it was chaotic".
At least 17 other people, mostly children, were also shot and taken to hospital, police said in a written statement.
Gun laws are extremely strict in Brazil, but it is not hard to illegally purchase a weapon.
"Then a lot of kids started running out, all screaming", he said.
Doria said the school had been evacuated and police were inspecting what appeared to be possible explosives left by the gunmen.
"I was shocked with the scenes I saw inside that school", Doria said.
The wounded student who took shelter in her house could not speak.
Marcelo Salles, commander of police forces in Sao Paulo state, spoke just outside the school and said that in his over three decades of service, he had "never seen anything like this, it was an unspeakably brutal crime". "It is the saddest thing I have seen in my life".