+Joshua The medic
It's just my hypothesis. Saw disturbing videos, including in my country. I know it's happening, but I never heard it. It makes you more curious.
The harmonics of the sound are like a low frequency horn trumpet sound, like a giant one. It came from everywhere, you cannot pinpoint the source, but I saw an special interestingly footage from Mexico (as always a hot spot) and there was a disc shaped UFO hovering in plane daylight over the city while the sounds shook the neighborhood.
Hear some Shofar Sounds at youtube and than you will see.
There are many more signs, including just before the beginning of the phenomena, a Crop Circle appeared in England, a very funny one. It depicted an pipe smoker hippie alien! see "ALIEN PIPE CROPCIRCLE"
Just first impression. Months after, the sounds started all around, and than, we realized that the agroglyph could be read in both perspectives: ASPIRING the smoke to give the idea of 60"s revolution OR blowing the pipe, and the pipe has, EXACTLY, the shape of a SHOFAR. The smoke twists to sound waves.
And you know, we're talking here UFO's and the BIBLE.