Law enforcement agencies and school boards across the nation are announcing heightened security measures in the wake of a deadly mass shooting at a Texas elementary school.

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Salvador Ramos, 18, who massacred children at a Texas elementary school, reportedly had few friends and started buying weapons as soon as he was of age.

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A 15-year-old girl in Germany said in an interview that she had met the future gunman about two weeks earlier on Yubo, an app that lets people livestream themselves to strangers.

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