(NewsNation) — 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 NewsNation.

Former Minneapolis Police Chief Medaria "Rondo" Arradondo told "NewsNation Live" that i

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