A 16-year-old boy killed three teachers and a 12-year-old student in two schools in the Brazilian town of Aracruz on Friday.
Twelve other people were injured, some seriously.
Younger had planned the act for a long time
Tjerk Bruhwiller
Correspondent for Latin America based in São Paulo.
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Video footage shows the perpetrator wearing a camouflage suit entering the school, where he himself attended classes until June, and aimlessly shooting at people.
A few minutes later he left the building and went to another school, where he continued shooting.
The perpetrator was caught shortly thereafter.
The shooter is the son of a police officer.
According to the investigators, the teenager used the police weapon and his father's car to attack the two schools.
He also carried another revolver with him.
According to investigators, the teenager had been planning the crime for a long time.
One of the recordings shows that he was wearing an armband with a swastika.
He had also published a photo with the Hitler book Mein Kampf in his digital networks.
He had the book from his father, who said he read the book out of curiosity and hated it.