Mass email hoax causes closures across the US and Canada

Emails threaten explosions unless people pay $20,000 in Bitcoin.

Enlarge / Police tape. (credit: Tony Webster / Flickr)

A tsunami of emailed bomb threats is prompting closures at hospitals, schools, public transit agencies, and business across the US and Canada.

Word of the emails surfaced Thursday morning in tweets such as this one:

And this one:

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