Concerns about CBRN (Chemical, Biological, Radioactive, Nuclear) weapons have featured prominently in both political debates and media reporting about the ongoing threat from al Qaeda since 9/11. This book provides a chronological account of al Qaeda's efforts to acquire a CBRN weapon capability, and the evolution of the al Qaeda leadership's approach to actually using CBRN weapons, set against the context of the politicisation of the threat of...