Santa Claus, the Tooth Fairy, Easter Bunny and the 9-11 "Theory"
9/11 third tower mystery 'solved'
By Mike Rudin
BBC, Conspiracy Files
One of the twin towers collapses
The final mystery of 9/11 will soon be solved, according to US experts investigating the collapse of the third tower at the World Trade Center.
The 47-storey third tower, known as Tower Seven, collapsed seven hours after the twin towers.
Investigators are expected to say ordinary fires on several different floors caused the collapse.
Conspiracy theorists have argued that the third tower was brought down in a controlled demolition.
Unlike the twin towers, Tower Seven was not hit by a plane.
That would make it the first and only steel skyscraper in the world to collapse because of fire.
The National Institute of Standards and Technology's lead investigator, Dr Shyam Sunder, spoke to BBC Two's "The Conspiracy Files":
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