This document lists the 193 governments, intragovernmental organisations and other entities which the NSA was granted the legal authority to intercept communications “about” for foreign intelligence purposes in August 2010: see the Washington Post article Court gave NSA broad leeway in surveillance, 30 June 2014.

This internal NSA post from September 2006 describes the evolution of the European Security Operations Center and the focus of the US-German collaboration in signals intelligence: see the Der Spiegel article Terrorverdächtige: NSA nutzte Erkenntnisse aus Deutschland-Filiale für Tötungen, 15 June 2014.

This internal NSA report, dated 14 January 2005, describes the contribution of operations in Germany (“NSA/CSS Europe”) to counter-terrorism operations in North Africa: see the Der Spiegel article Terrorverdächtige: NSA nutzte Erkenntnisse aus Deutschland-Filiale für Tötungen, 15 June 2014.

This GCHQ research paper from 6 November 2009 outlines what kinds of data the agency can extract from internet radio stations and their listenership, grouped by country: see the Intercept article Profiled: From Radio to Porn, British Spies Track Web Users’ Online Identities, 25 September 2015.

Beginning in 2003, a team of NSA counterterrorism analysts based at NSA/CSS Europe began a dedicated project to support counterterrorism efforts in North Africa. The team collected signals intelligence, which they distributed to U.S. European Command and U.S. ambassadors, who then transmitted this information to governments in Mali, Algeria, and Mauritania. They believe this effort was "responsible for the capture or kill of over 40 terrorists."