Huntsville Police officers block an entrance to Redstone Arsenal, Tuesday, June 27, 2017 in Huntsville, Ala. Authorities locked down the Alabama military post on Tuesday amid reports of possible active shooter, and workers were advised to "run hide fight." Redstone Arsenal spokesman Christopher Colster told WAFF-TV that the base near Huntsville received reports of a person possibly armed with a weapon at a building. (AP Photo/Eric Schultz)
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