This book finds its origins in a transatlantic colloquium held in the European Parliament in Brussels in May 2002. After an introductory overview of the US and European responses to 9/11 it addresses the main legal aspects of the fight against international terrorism, namely police and judicial cooperation (including mutual legal assistance, extradition and the role of entities like Europol and Eurojust), financial initiatives (e.g. by the UN Security Council, the FATF and the EU), human rights and rule of law issues (such as trial by military commissions, detention of alleged unlawful...