The Criminal Investigation and Detection Group (CIDG) has recommended the filing of charges against suspended Senate Office of Sergeant-at-Arms (OSAA) chief, retired General Mao Aplasca, in connection with the shooting incident at the Senate on the evening of May 13.
In a press conference, CIDG Director Major General Alexander Morico stated that Aplasca and two other OSAA personnel violated the Rules of Engagement and provisions of Republic Act (RA) 11917, also known as the Private Security Services Industry Act.
The CIDG has submitted its findings to the Department of Justice (DOJ) for further review and validation.
During a Malacañang press conference on Tuesday, May 19, 2026, Interior and Local Government Secretary Jonvic Remulla and Philippine National Police (PNP) Chief General Jose Melencio Nartatez Jr. confirmed the CIDG investigation. They stated that Aplasca, although not provoked, was the first to fire during the incident at the Senate, which occurred amid tensions surrounding the impending arrest of Senator Ronald "Bato" dela Rosa on May 13.
According to General Nartatez, the investigation revealed that an NBI agent—deployed to the GSIS buildings at the request of agency officials—also discharged his weapon while retreating as a "cover fire" after being shot at by OSAA personnel.
Director Morico noted that the incident could have been prevented if there had been clear communication between the OSAA and the GSIS.
Prior to the shooting, a drilling sound was heard on the wall separating the Senate and GSIS premises, causing panic among those inside the Senate building, including senators and media personnel.
