A report says Canada allowed the U.S. National Security Agency (NSA) to spy on a Group of 20 (G20) summit in Toronto in 2010.
The report by the Canadian Broadcasting Corporation cited documents provided by former U.S. intelligence contractor Edward Snowden.
The Toronto G20 summit was attended by President Barack Obama and other world leaders, who discussed ways to spur global economic growth and prevent another financial crisis.
The report quoted an NSA document as describing the operation as "closely coordinated” with Canadian counterparts.
Under Canadian law, Canada’s Communications Security Establishment agency cannot spy on anyone without a warrant or have surveillance carried out on its behalf by another agency.
Controversy over surveillance programs operated by U.S. agencies has increased in recent months following disclosures by Snowden.
Based on reports from Reuters and AFP