Mystery Boom In Phoenix Leaves Many Looking for Answers to What Caused It
People across the Valley reported a loud booming noise and mysterious shaking of their windows and doors last night.
Some took to Twitter, believing it was an earthquake.
But the US Geological Survey reports no earthquakes of any magnitude for at least the last seven days.
Aviation experts said a high-altitude sonic boom could sound like a low rumble. Civilian aircraft are prohibited from flying at supersonic speeds over the continental U.S., but military aircraft are allowed to break the sound barrier.
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