A shooter opened fire Wednesday morning during Mass at Annunciation Catholic School in Minneapolis, killing two children and injuring 17 other people before dying by suicide, officials said.

Minneapolis Police Chief Brian O’Hara said the shooter, 23-year-old Robin Westman, did not have an extensive known criminal history, acted alone and had legally purchased the weapons recently.

A law enforcement official told the New York Times that investigators believe the attacker was a former student at the school and the suspect’s mother is a retired school employee.

O’Hara said authorities are aware of a video showing writings that the shooter had timed to be released on YouTube.

It “appeared to show (the suspect) at the scene and included some disturbing writings,” O’Hara said. With the assis

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