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http://www.krem.com/article/news/local/next/a-look-at-every-school-shooting-and-the-warnings-signs-before-they-happened/73-531119651
Citations are provided in the article.
http://www.krem.com/article/news/local/next/a-look-at-every-school-shooting-and-the-warnings-signs-before-they-happened/73-531119651
Citations are provided in the article.