The five wounded victims from the Thomazia Montoro school in Sao Paulo were in hospital in stable condition. Peter Dazeley/Gettyimages

Authorities in Brazil's largest city said a 13-year-old student attacked a public school with a knife on Monday, killing a 71-year-old teacher and injuring three teachers and two fellow students.

The five injured people from the Thomazia Montoro school in Sao Paulo were in a safe condition at the hospital.

The alleged assailant was taken into custody, and the state's military police are looking into the matter.

"Our efforts are concentrated on helping the wounded and comforting the family members," Gov. Tarcísio de Freitas wrote on social media, reports Our Midland.

A student who spoke to reporters outside of the school with his mother claimed that the assailant had insulted a different student the previous week and that the female teacher he mortally stabbed had attempted to mediate the situation.

According to Gabriel Livramento, 13, a classmate of the suspect who had called the other student a "rat," "the other one did not like it, and they began fighting."

He continued by saying that the attacker had threatened to take action because he did not like the manner the teacher had stepped in.

The instructor was stabbed in the head and back on Monday by an assailant who had a skull mask on. Livramento said the assailant approached the class. The entire class then reportedly began to sprint, he claimed.

In a news conference that afternoon, authorities revealed that the boy had looked online for information on how to purchase a firearm. He had just lately transferred from another school.

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