New Footage of WTC Collapse on 9/11 Has Appeared on Internet

After seven years, startling new footage of the collapse of the North Tower of the World Trade Center and World Trade Center 7 have mysteriously surfaced on an internet video sharing site. The anonymous footage, which lacks a soundtrack, contains a clear shot of a side of WTC 7 as it collapses and explosions can be seen shattering the windows.
(Pretty obvious squibs at around 3:37.)