9/11 Video of North Tower "squib" Explosions seconds before 2nd Tower Attack

http://www.military.com/video/operations-and-strategy/terrorism/rare-new-footage-of-9-11-wtc-attack/1785368803001/

Notice multiple explosions including one on the far right of the video on the North Tower occurring, just a few seconds before you see the first explosion on the South tower. (01:56)