In addition to the four dead, there are 12 injured, Brazilian G1 news portal reported on Saturday.
According to local media reports, on Friday morning, a 16-year-old rushed into a staff room in a state school in Aracruz and opened fire at the teachers there, then jumped into a car and headed to a private school on the same avenue, where he killed a student. The shooter was reportedly a student at one of the schools.
Espirito Santo Governor Renato Casagrande said on Friday that the attacker had been arrested.