Explosion at the time of the 'collapse' of World Trade Center Building 7 on 9/11.

Time: 5:20 pm.
Location: Corner of William St. & Liberty St (about 5 blocks Southeast of WTC 7).

The video clip repeats the explosion three times. See the startled reaction of the reporter who immediately turns and looks in the direction of WTC 7. Then the video clip fast forwards to 50 seconds later in the video where you hear on NYPD radios, "World Trade 7 is gone, 7 is gone, 7 is gone".