It was a horrifying scenes in Sao Paulo, Brazil and the adult who was killed was the principal of the Raul Brasil public Grade school.
At least nine people were killed on March 13, 2019 when two teenagers opened fire at a school in Suzano, in Sao Paulo, Brazil, at 9:30 a.m.; the boys then killed themselves.
The gunmen wearing face masks, aged 17 and 25, killed themselves after the attack, according to police.
About 1,000 children attend the school, police said.
Brazil has one of the world's highest murder rates, but school shootings are rare.
President Jair Bolsonaro ran on a platform that included promises to crack down on criminals, in part by expanding public access to guns.
A man comforts a woman at the Raul Brasil State School in Suzano, Brazil, on Wednesday.
While gun crime is common in Brazil, mass shootings like this nature are not. The gunmen took their own lives, officials said.
While gun laws are considered strict in Brazil, it is not hard to illegally purchase a weapon. He immediately pulled a pistol out of his jeans and shot into a group of eight students, hitting at least two, who dropped to the floor.
Sales said the assailants used "a.38 calibre revolver and a medieval weapon that looked like a bow and arrows".
The wounded student who took shelter in her house could not speak.
He added that the school had been evacuated and police were inspecting possible explosives left by the shooters.
"This was the saddest thing I have tended to in my whole life", Sao Paulo state Governor Joao Doria said.