] Most of the new information comes from handwritten
] documents and computer hard drives seized during the
] March 1 capture of Khalid Sheik Mohammed, regarded by
] some government analysts as al Qaeda's most important
] operational planner. Known inside al Qaeda as "the
] Brain," Mohammed has acknowledged being the principal
] author of the Sept. 11, 2001, plot. Significantly, one
] official noted, Mohammed was arrested at a Rawalpindi,
] Pakistan, home owned by Abdul Quddoos Khan, a
] bacteriologist with access to production materials and
] facilities who has since disappeared.

More info from Mohammed's laptop.

Al Qaeda Near Biological, Chemical Arms Production (washingtonpost.com)