Canadian authorities allowed the U.S. National Security Agency to spy in the country during the during the 2010 Group of 20 summit in Toronto, revealed a CBC news report citing documents put forth by NSA whistleblower Edward Snowden as a reference.

The documents indicate that the NSA had used the U.S. Embassy in Ottawa as a command post for a six-day spying operation in June 2010.

The report said the operation was no secret to Canadian authorities, with an NSA briefing note describing the operation as "closely coordinated with the Canadian partner."