Gunman kills 19 children, 2 teachers at elementary school in Texas l ABCNL
ABC News’ Senior Investigative Reporter Aaron Katersky and ABC News contributor Elizabeth Neumann discuss law enforcement missing warning signs before recent mass shootings. WATCH the ABC News Live Stream Here: https://www.youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch More on http://abcnews.go.com/…
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