Alongside the numerous documents posted on Islamist websites on how to prepare various types of explosives, 'An Encyclopedia for the Preparation of Nuclear Weapons' has recently appeared on such websites. The 'Encyclopedia' was posted on October 6, 2005 on the Islamist forum Al-Firdaws  ('Paradise'), by someone whose nom de guerre is Layth Al-Islam ('The Lion of Islam'). A link to a slightly different version appeared on October 9 in a Yahoo! discussion group called ' mujahedon.' 
The 'Encyclopedia,' which contains nine lessons in approximately 80 pages in Arabic, was published under the title 'The Nuclear Bomb of Jihad and the Way to Enrich Uranium' and was presented as 'a gift to the commander of the Jihad fighters, Sheikh Osama bin Laden, for the purpose of Jihad for the sake of Allah.'
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