() Investigators are searching for answers and a motive following the shooting that occurred Wednesday at Annunciation Catholic School in Minneapolis, which resulted in the deaths of two children and injured 18 people.

The shooter, Robin Westman, 23, was a former student at the school, and their mother worked at the parish; however, Minneapolis Police Chief Brian O’Hara told ABC News Thursday that a specific “triggering event” or motive remains unclear.

O’Hara previously confirmed that there was “some sort of manifesto that was timed to come out on YouTube. It’s been taken down, and our investigators are going through that to try to develop a motive,” as previously reported by .

Former Minneapolis Police Chief Medaria “Rondo” Arradondo told ” Live” that investigating “digital forensics” will be essential to addressing questions that police still have about the shooting.

Despite the shooter being deceased, “there’s still a lot that can be learned from this investigation,” Arradondo said. “Was there any communication that the shooter had prior to this tragedy?”

Four search warrants were executed yesterday in connection with the investigation. One of the warrants is for the shooter’s vehicle, while the other three are for local residents the shooter had some association with.

Arradondo said that in addition to investigating family, friends and coworkers, police may find answers in online communications the shooter engaged in, including on the dark web.

FBI Director Kash Patel announced Wednesday that the organization “is investigating this shooting as an act of domestic terrorism and hate crime targeting Catholics.”

The Department of Homeland Security confirmed that the phrases “For the Children,” “Where is your God?’” and “Kill Donald Trump” were written on Westman’s rifle magazines.