MINNEAPOLIS — Many questions surround Wednesday's deadly mass shooting at Annunciation Catholic School in south Minneapolis, but one has pushed its way to the forefront.

Why did it happen?

Investigators are examining the videos, writings and movements of the shooter who fired through the windows as dozens of students, parishioners and family members attended a special mass, leaving two children dead and 17 others wounded, some of them critically. They are hoping to uncover connections to the church and its school to understand why 23-year-old Robin Westman planned and then executed the cold-blooded attack.

Armed with a rifle, shotgun and pistol, Westman shot dozens of rounds Wednesday morning, deliberately targeting children sitting in the pews during mass, Minneapolis Police Chief

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