SAO PAULO (AP) — Brazilian authorities on Friday arrested a suspect linked to a school shooting that left seven people dead, but later allowed him to return home.

Sao Paulo's Court of Justice said Friday that the teenager was let go after prosecutors took his testimony. Police have not revealed his name.

The Sao Paulo state prosecutor's office said he could still be taken into custody if new investigations revealed his involvement in the shooting.

Five students, a teacher and a school administrator were killed Wednesday at Raul Brasil state school in the city of Suzano, on the outskirts of Brazil's largest city. One of the shooters also killed his uncle shortly before carrying out the massacre.

Nine others were wounded, including seven who were still hospitalized Thursday.

Attackers Guilherme Taucci Monteiro, 17, and Luiz Henrique de Castro, 25, are also dead.