Mass email hoax causes closures across the US and Canada

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A tsunami of emailed bomb threats is prompting closures at hospitals, schools, public transit agencies, and businesses across the US and Canada.
Word of the emails surfaced Thursday morning in tweets such as this one:

So I actually just got a bomb threat in my work email today ordering me to send the person $20,000 via bitcoin or they will blow up my place of work.... 2018 is wild pic.twitter.com/sn0vVLwe6v
— Ryan William Grant (@TheeRyanGrant) December 13, 2018

And this one:
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