““Bomb threats tactics are evolving; copycats incidents appear to be on the rise,” the company said on Twitter.”
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If US security agencies pursued these home-grown terrorists (because that’s what they are) with as much zeal as they’re chasing Trump’s so-called undocumented “bad dudes”, these threats  would not be increasing.

It wouldn’t fit Trump’s anti-immigrant, anti-refugee narrative but it would be a more productive use of their time and efforts.