British government intercepted foreign politicians' communications at G20 summits

"Some delegates were tricked into using internet cafes which had been set up by British intelligence agencies to read their email traffic. There have often been rumours of this kind of espionage at international conferences, but it is highly unusual for hard evidence to confirm it and spell out the detail. The evidence is contained in documents – classified as top secret – which were seen by the Guardian. They reveal that during G20 meetings in April and September 2009 GCHQ used what one document calls "ground-breaking intelligence capabilities" to intercept the communications of visiting delegations.

This included:
•Setting up internet cafes where they used an email interception programme and key-logging software to spy on delegates' use of computers;
•Penetrating the security on delegates' BlackBerrys to monitor their email messages and phone calls;
•Supplying 45 analysts with a live round-the-clock summary of who was phoning who at the summit;
•Targeting the Turkish finance minister and possibly 15 others in his party;
•Receiving reports from an NSA attempt to eavesdrop on the Russian leader, Dmitry Medvedev, as his phone calls passed through satellite links to Moscow."