Canada allowed the U.S. National Security Agency (NSA) to conduct widespread surveillance during the 2010 Group of 20 summit in Toronto, according to a media report that cited documents from former NSA contractor Edward Snowden. The report by the Canadian Broadcasting Corp ... cited briefing notes it said showed the United States turned its Ottawa embassy into a security command post during a six-day spying operation by the top-secret U.S. agency as President Barack Obama and other world leaders met that June. One of the bylines on the CBC report was Glenn Greenwald, the U.S. journalist who has worked with Snowden on several other NSA stories. CBC ... quoted an NSA briefing note describing the operation as closely coordinated with the Canadian partner". The Canadian equivalent of the NSA is the Communications Security Establishment Canada, or CSEC. CBC said the documents did not reveal the targets of the NSA operation, but described part of the U.S. eavesdropping agency's mandate at the Toronto summit as "providing support to policymakers". CSEC, which has a very low public profile, employs about 2,000 people. It is part of the so-called Five Eyes intelligence-sharing network that also includes the United States, Britain, New Zealand and Australia. Last month, Brazil angrily demanded an explanation for media reports which said CSEC agents had targeted its mines and energy industry.