Unexplained Boom

http://en.wikipedia.org/wiki/Unexplained_boom

An unexplained boom is a very loud noise similar to a sonic boom created by the supersonic flight of an aircraft. However these booms are unexplained for various reasons - for instance because no supersonic flight was scheduled at the time the boom was heard.

Media in the US reported several unexplained booms. This phenomenon is rarely reported outside the US.

"This section requires expansion?” No shit. Unexplained, indeed.

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