Dallas city officials blamed hackers for setting off emergency sirens.
Dallas city officials blame 'hack' for siren malfunction #U_S_A_ #iNewsPhoto
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Dallas city officials have added extra encryption to bolster the security of outdoor warning sirens hacked early Saturday.
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The Dallas News building, on Commerce Street between Lamar and Austin, Dallas, Texas, circa 1885. Next to it were the Grand Windsor hotel (left), and the two-story Dallas City Hall. Photo courtesy Dallas Morning News.