[IH] Over the past few weeks it has become evident that helicopters were indeed airborne and lurking behind the Mandalay Bay before, during, and after the Route 91 Harvest Music Festival massacre which occurred on the night of October 1.

Now the investigation has turned toward gathering evidence which could prove that shots were actually fired from those helicopters.

Most recently, the “John E Hoover” YouTube channel published a video in which experts may be able to use and analyze what appears to be muzzle flash coming from the chopper in the first Dan Brandon Bilzerian clip in the video.

Watch for yourself.