How did those responsible hijack the planes, and could more have been done to prevent the 9/11 atrocity?
Peacetime regulations meant that an American fleet was unprepared for the surprise Japanese attack which took place in December...
In October 1999, an ordinary journey turned into a nightmare for passengers when two trains collided.
Forty five schoolchildren died when a plane collided with another - find out what went wrong.
Flick through a selection of images from the old series of Seconds From Disaster.