Posted on YT a couple of days ago, this is apparently new footage of the attacks on the World Trade Center in New York. I don't recall seeing it before anyway.
I'm sure this will be studied closely by researchers for any new evidence. It's interesting they believe bombs are responsible, and miss the second impact. It should be remembered that 'explosions' in both towers independent of the plane strikes were reported by many witnesses. And one is audible in the video, at approx. 7.16, the sound of something like an explosion.
Warning: does contain disturbing scenes (people falling/jumping from the towers).