The devastating attacks on the World Trade Center and Pentagon stunned people across the world. Most can remember exactly what they were doing as the shocking images were played and replayed.
In a series of interviews with the BBC's World Service, Radio 4 and BBC News Online, 16 people recall how they heard about the dramatic events of 11 September 2001 and how it affected their lives.
Click on the links to read and listen to their stories.
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