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National UFO Reporting Center
Sighting Report
Occurred : 1/16/2014 17:30 (Entered as : 01/16/14 17:30)
Reported: 1/17/2014 7:16:52 AM 07:16
Posted: 1/24/2014
Location: Belgrade, MT
Shape: Unknown
Duration:1 minutes
Low frequentcy sound vibration...like a horn.

I heard the most unusual "horn" sound...like a Low rumble horn...low frequency. I never have heard this before...it encompassed all. Everything was this low heavy vibration "horn". I did not see anything as it was dark.