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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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