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BBC NEWS Investigating Al-Qaeda
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The US has launched the biggest criminal investigation in its history in an effort to find out who was behind the attacks on New York and Washington.


Key elements of the investigation explained


BBC Security correspondent Frank Gardner details al-Qaeda's intent
  
  
  


In-depth coverage of the attacks on 11 September 2001


Charting major developments in the battle against al-Qaeda


Uncovering the terrorist funds network - who's chasing the money?

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