Independent Television News (ITN) has aired a short news clip explaining the most popular conspiracy theories behind the 9/11 attacks. One theory says that the twin towers collapsed due to controlled demolitions. Another theory says that the nose cones of the planes that hit the twin towers contained explosives.
Conspiracy theorists say a 757 couldn't have crashed into the Pentagon because there was not enough damage. One theory says that the jet that crashed in Shanksville, PA was brought down by a missile. The official story says that passengers brought down the plane after it was taken over by terrorists.
This video is from ITN, broadcast November 10, 2008.