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| Osama Bin Laden has not been seen since late 2001 |
Al-Qaeda is an organisation of Islamic militants that has declared "holy war" on Americans, Jews and their allies.
It is blamed for thousands of deaths in the 11 September attacks on the US and other attacks around the world.
It is led by Osama Bin Laden, a millionaire Saudi dissident stripped of his citizenship in 1991.
Experts say it is a loose-knit global network, with links to radical groups in Algeria, Central Asia, Kashmir, the Philippines and across the Middle East.
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