Who is Osama Bin Laden?
Osama Bin Laden is top of US President Bush's most wanted list, but to many young people in the Muslim world, he is a hero.
He is wanted in connection with a number of atrocities, including the 1998 bombing of two US embassies in East Africa and - most notoriously - the attacks on New York and Washington on 11 September 2001.
Since then, his al-Qaeda organisation has been linked indirectly with bombings on the island of Bali in Indonesia and its capital Jakarta, as well as with devastating suicide attacks in Casablanca, Riyadh and Istanbul.