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The shooter who attacked a Catholic school on Wednesday posted social media videos and writings that betrayed a litany of grievances and obsessions.

By Talya MinsbergAmy Harmon and Aric Toler

The person who the police say opened fire on a Catholic school in Minneapolis on Wednesday appears to have known the school well.

Robin W. Westman, who officials said strafed the church through the stained glass windows, killing two children, was believed to have once attended the school at Annunciation Catholic Church, according to a law enforcement official with knowledge of the investigation.