CRIMINAL complaints have been filed against the father of the student who carried out the fatal shooting at Ateneo de Zamboanga University (ADZU) Junior High School and a school security personnel, the Philippine National Police (PNP) said Thursday.

The Aug. 18 incident left a Grade 10 student dead and another wounded before the shooter turned the firearm on himself.

According to the PNP, the father, a customs police officer, was the registered owner of the two firearms used in the shooting. The school security personnel, meanwhile, was cited over alleged lapses in implementing campus safety protocols.

The Police Regional Office 9-led Special Investigation Task Group found no evidence that the shooting was part of a conspiracy involving any organization, group, or other individuals.

Investigators also found no established school-related or personal grievance that could adequately explain the attack. However, the probe pointed to prior preparation and the student’s exposure to violent online content as circumstances surrounding the incident.

The investigation further found deficiencies in firearm storage and accountability that enabled unauthorized access to the weapons. Security shortcomings at the school, particularly in screening people entering and leaving the campus, were also identified.

Based on the findings, a complaint for reckless imprudence resulting in homicide and physical injury was filed with the appropriate prosecutorial authority against the firearm owner and the security personnel.

PNP chief Gen. Jose Melencio C. Nartatez Jr. said investigators were committed to establishing the facts while respecting due process.

“We owe it to the families and to the school community to get the facts right,” Nartatez said, stressing that accountability must be determined through evidence and the proper legal process.

He also urged firearm owners to strengthen the security of their weapons and called on schools and security personnel to regularly assess access controls and screening procedures.

Nartatez likewise encouraged parents and members of the public to report threats, violent behavior and other warning signs that could potentially put others at risk.