9/11 CLEAR bomb going off in WTC BEFORE first plane EVER hit

well this video is clips of people say there was a BOMB that when off in WTC then the first plane hit.but the best video is around 6:38 when there is live feed from a new camera setting on the ground where you can hear the plane coming in and you hear the bomb go off and it's felt by the camera from setting on the ground then you still hear the plane still coming in and then hear it hit WTC