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National UFO Reporting Center
Sighting Report
Occurred : 2/11/2012 21:00 (Entered as : 02/11/2012 21:00)
Reported: 2/12/2016 3:39:31 PM 15:39
Posted: 2/19/2016
Location: Flowery Branch, GA
Shape: Unknown
Duration:3-4 minutes
Loud, constant sound from unidentified source.

I could not see anything but there was an extremely loud, continuous sound that changed slightly in tone, over the 3-4 minutes it was audible.

It gradually diminished in volume as if the object creating it was moving away until it was no longer audible. I am sure it was not a train whistle nor the warning siren at our nearby fire station. It did not sound at all like a truck or a vehicle horn. I've also never heard a car alarm that sounded similar.

I recorded about the last 2 minutes of it on my phone. My daughter also heard it.