Note that 6 seconds into the video the camera shakes for almost a second, too long to be a kick or a jostle. Moments before the shake a large piece of debris is knocked from the right side of the building (see image on right).

Click for full size frame Careful study of the smoke before...

Click for full size frame and after...

Click for full size frame ... clearly shows new blooms of smoke exiting the opening on the front facing side of the building as well as to the right. This video shows two perspectives of the collapse. The inset video shows the camera shake at roughly six seconds. Five seconds later the main video shows smoke appearing at the building's base. WMV video download (363kB)