LONDON -- British spies intercepted the phone calls of foreign politicians and delegates at the G-20 summit in 2009, according to documents provided to The Guardian by self-declared NSA leaker Edward Snowden, the newspaper reported Monday.
U.K. intelligence agency GCHQ also monitored the computers of delegates at the London conference and tried to capture their passwords, the newspaper said.
The report came hours before President Barack Obama and other world leaders from the G-8 countries - all of which are in the G-20 – were due to attend a two-day summit in Enniskillen, Northern Ireland.
Although espionage at international conferences has often been rumored, it is rare for evidence to be uncovered, The Guardian said.
It said the evidence was contained in classified documents shown to its reporters by Snowden, a U.S. citizen who worked for a private defense contractor and now faces a federal investigation into a string of embarrassing leaks about the National Security Agency and the PRISM surveillance program.
Snowden is reportedly in Hong Kong, where he told The Guardian that he was hoping to fight the U.S. government in the courts.
A spokesman for Britain’s foreign ministry declined to comment on the report. A spokesman for GCHQ said the agency never commented on intelligence matters.