Over 40 People Have Been Arrested As Potential Mass Shooters Since El Paso

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The New York Times
SOURCE: https://www.huffpost.com/entry/mass-shooting-plot-arrests-el-paso_n_5d66d1eae4b063c341f9f2da
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Summary

Tips about potential acts of mass killings have spiked, and law enforcement appears to be paying close attention to threats.

As said here by Christopher Mathias