http://denver.cbslocal.com/2017/11/21/mysterious-booms-heard-in-colorado/

jadamz

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More mystery Earth Boom's....

Hundreds of people from Lakewood to Brighton, Lochbuie and Elizabeth took to social media reporting one to two distinct ‘explosion-like’ sounds that rattled windows and shook walls.

One CBS4 viewer in Brighton told me a chair tipped over on his porch!

The booms join a growing list of mysterious ‘explosion-like’ sounds reported in recent weeks around the United States.
 
These booms and strange noises being heard around the world is worrysome! Nobody has any answers.