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National UFO Reporting Center
Sighting Report
Occurred : 4/18/2019 09:00 (Entered as : 04/18/19 09:00)
Reported: 4/18/2019 8:08:08 AM 08:08
Posted: 4/18/2019
Location: Milaca, MN
Shape: Unknown
Duration:6 minutes
Extremely loud low frequency rocket like rumbling sound traveling east to west in the sky.

At 9 a.m. this morning, I heard a rumbling sound that I thought was thunder and it got progressively louder. I then realized that it was not funder but some sort of aircraft traveling in an east-to-west direction.

As it got louder and over my location I realized that this was much louder and lower in frequency than the normal jet.

I have heard many different Jets even in full afterburner and this was much louder and lower and frequency and sounded more like a very large rocket exhibiting the typical low-frequency pops that are heard with large rockets.

the total time that I heard this event was probably 5 to 6 minutes before the sound finally dissipated to the West.

the sky was totally overcast so I was not able to visually see what the object was.