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Leah Hogsten | The Salt Lake Tribune Students hug across the street from Union Middle School. A 16-year-old boy was critically i Leah Hogsten | The Salt Lake Tribune A 16-year-old boy was critically injured after being shot outside Union Middle School in Sa Leah Hogsten | The Salt Lake Tribune A 16-year-old boy was critically injured after being shot outside Union Middle School in Sa Leah Hogsten | The Salt Lake Tribune Kalani Matthews, 17, center, and friends watch the police scene across the street at Union Leah Hogsten | The Salt Lake Tribune "He's alive?" cried Mason Lewis, 14, with his hands on his head, after Dusti Rowl Leah Hogsten | The Salt Lake Tribune Mason Lewis, 14, is comforted by a passerby after learning of a shooting outside Union Midd Leah Hogsten | The Salt Lake Tribune Kalani Matthews, 17, right, gets a hug from Dusti Rowland, 16, across the street from Union Leah Hogsten | The Salt Lake Tribune Kalani Matthews, 17, and friends watch the police scene from across the street from Union M Leah Hogsten | The Salt Lake Tribune Kalani Matthews, 17, right, and his friends gather around Rachel Otteson, 18, as they try t Leah Hogsten | The Salt Lake Tribune Police investigate a shooting last week in which a 16-year-old boy was critically injured a