This GCHQ presentation from November 2010 shows that the agency was logging 30 billion metadata records per day by that year: see the Intercept article Profiled: From Radio to Porn, British Spies Track Web Users’ Online Identities, 25 September 2015.
This internal NSA information paper, dated 19 April 2013, describes a “far reaching technical and analytic relationship” with Israel’s SIGINT National Unit (ISNU): see the Intercept article Cash, Weapons and Surveillance: the U.S. is a Key Party to Every Israeli Attack, 4 August 2014.
This undated presentation from the NSA’s European Cryptologic Center explains some of the activities of the agency’s main European base: 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 background document, prepared by NSA officials in advance of a conversation with representatives of Germany’s domestic (BfV) and foreign (BND) intelligence services, outlines the continuing cooperation between the three agencies in the field of counterterrorism. Extracts from this document were published by Der Spiegel in July 2013: see the Der Spiegel article New NSA Revelations: Inside Snowden’s Germany File, 18 June 2014.