9/11: Images from New York that shocked the world
11 September 2011 Last updated at 09:38 BST
For many people across the world the terror attacks of 9/11 played out live on television screens.
The images were both painful and shocking and despite the passing of time they remain powerful.
This is how the BBC's correspondent James Robbins described the day on the Ten O'Clock News 10 years ago.
His report shows the distressing moment when the second tower was struck by a plane and then collapsed.