(NewsNation) — A "manifesto" posted by the shooter who opened fire at a Catholic school Wednesday, killing two children and injuring more than a dozen, showed they wrote several messages on weapons and ammunition, including one that read "kill Donald Trump," authorities said.

The video was posted to YouTube by Robin Westman, who has been identified as the person who attacked Annunciation Catholic Church in Minneapolis during a morning Mass, police said.

Minneapolis Police Chief Brian O'Hara said Westman had "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."

In the video, the shooter films several guns, including a rifle and a pistol, for what appears to be a detailed, planned atta

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