A Minneapolis community is in mourning tonight after tragedy unfolded inside a Catholic church. A gunman opened fire during Mass, killing at least two children and wounding several others. As investigators piece together the shooter’s troubled past and his ties to the church, we’re also hearing harrowing accounts from young witnesses who lived through the nightmare. NBC’s Shaq Brewster, Maggie Vespa, and Tom Llamas have the latest on this developing story.

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