The Guardian said:
Edward Snowden papers unmask close technical cooperation and loose alliance between British, German, French, Spanish and Swedish spy agencies
The German, French, Spanish and Swedish intelligence services have all developed methods of mass surveillance of internet and phone traffic over the past five years in close partnership with Britain's GCHQ eavesdropping agency.
The bulk monitoring is carried out through direct taps into fibre optic cables and the development of covert relationships with telecommunications companies. A loose but growing eavesdropping alliance has allowed intelligence agencies from one country to cultivate ties with corporations from another to facilitate the trawling of the web, according to GCHQ documents leaked by the former US intelligence contractor Edward Snowden.