Martinez said the corresponding information will be filed with the Family Court at the Regional Trial Court of Tacloban City.
The shooting, which occurred at San Jose National High School, left three teenagers dead and 13 others injured.
Police reported that two Grade 9 students, aged 14 and 15, allegedly opened fire inside the campus.
Pacencia, who is the aunt of one of the minor suspects, previously testified before a Senate hearing that the minor — identified by authorities under the alias “Nash” — unlawfully entered her home by damaging a lock and took the firearm used in the attack.