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Calls for change remain a decade after Sandy Hook school massacre

Top hostage negotiator on Americans wrongfully held by Moscow

Not just 'mall cops': Why the private security industry is growing

National News

More schools develop clear backpack policies to combat school shootings.

National News

Celebrities make emotional pleas for change after Texas school shooting

Data: Mass shootings are an American problem

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This app could change response times and communication during mass shootings

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Other countries' gun violence solutions

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Officials explain how gunman entered Texas classroom

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Lawmakers tout new gun law following Highland Park parade shooting