Two masked men armed with a gun, knives, axes and crossbows descended on a school in southern Brazil on Wednesday, killing five students and two adults before one killed the other and then himself, authorities said.
The men, identified as former students at the school in a suburb of São Paulo, also shot and killed the owner of a used car business nearby before launching the attack on the school, authorities said.
Besides the five students, the dead included a teacher and a school administrator, said João Camilo Pires de Campos, the state's public secretary. Nine others were wounded in the school attack and hospitalized, he said.
"This is the saddest day of my life," de Campos said, speaking to reporters outside the school in the Sao Paulo suburb of Suzano.
The assailants were trying to force their way inside a room at the back of the school where many students were hiding when police arrived. Instead of facing police, they took their own lives. Monteiro shot de Castro in the head and then shot himself, police said.
Students gathered outside the school recounted harrowing attacks and seeing several bodies lying in pools of blood.
Kelly Milene Guerra Cardoso, 16, said she and other students took refuge in the school's cafeteria, locked the door and lay on the floor.
In 2011, 12 students were killed by a gunman who roamed the halls of a school in Rio de Janeiro, shooting at them.
President Jair Bolsonaro ran on a platform that included promises to crack down on criminals, in part by expanding public access to guns. Soon after his Jan. 1 inauguration, Bolsonaro issued a decree making it easier to buy a gun.
"A monstrosity and cowardness without equal," Bolsonaro wrote in a tweet expressing his sympathies for the families of the victims of Wednesday's attacks.
Similar to arguments made by proponents of less gun regulation in the United States, Bolsonaro and his supporters argue that expanded access to guns will combat crime.
Senator Major Olimpio, a member of Bolsonaro's party and a proponent of loosening gun legislation, again made that argument hours after Wednesday's rampage.
"We can't let those who take advantage of this tragedy speak about how disarmament is the solution," he tweeted, adding: "Weak and shameful 'disarmament farce,' which gave guns to criminals and prevented self-defence."