MINNEAPOLIS — Mike Garrity was walking home from the gym Wednesday morning when he heard a series of loud noises that he initially thought were coming from a nail gun at a construction site. But when Garrity got closer to the Annunciation Catholic Church, he realized something terrible had happened. Garrity, 64, who lives across the street from the church and the adjoining Catholic elementary school, saw about a dozen crying children stream out of the school. At least three of

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