Though the Sept. 11, 2001, terrorist attacks were carried out in New York and Washington, the plans were hatched in Hamburg, Germany -- a terrifying fact that sparked the largest federal investigation in the country's history. As Islamic groups and other organizations came under increased scrutiny, Germany began to re-examine its constitutional guarantees of freedom of assembly.

DW-WORLD has compiled a complete dossier of coverage of Germany's investigations on terrorist activities related to al-Qaeda and the Sept. 11 attacks.