The TE-SAT aims to provide law enforcement officials, policymakers and the general public with facts and figures regarding terrorism in the EU, while also seeking to identify trends in the development of this phenomenon. In 2011, the total number of terrorist attacks and terrorism-related arrests in the EU continued to decrease. This is a welcome development, but does not necessarily reflect a diminished threat. The death of Osama bin Laden has not removed the threat of al-Qaeda-inspired terrorism. Instead, the threat has evolved and lone actors or small EU-based groups are becoming increasingly prominent, as is the Internet as a key facilitator for terrorism-related activities., The incidents in Norway and the arrests in a number of Member States of individuals for the preparation of terrorist attacks are proof of a continuous need for vigilance, and indicate that the reduction of the numbers of attacks is at least partly due to effective law enforcement interventions. The TE-SAT is a public report produced by Europol on the basis of information provided and verified by the competent law-enforcement authorities in the Member States of the EU. The arrests and terrorist or violent extremist incidents that took place in the EU, as referred to in this report, are those that Member States have reported to Europol for the purposes of the TESAT.