What triggered the blast that shook everything in Vegas tonight?

What triggered the blast that shook everything in Vegas tonight?

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Cause still unknown of flash of light and boom that shook houses in ...
Cause still unknown of flash of light and boom that shook houses in ...
2nd blast likely needed to complete Las Vegas hotel implosion | fox61.com
2nd blast likely needed to complete Las Vegas hotel implosion | fox61.com
Moment mysterious loud boom shakes houses as a huge flash lights up the ...
Moment mysterious loud boom shakes houses as a huge flash lights up the ...