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German Chancellor Angela Merkel (L) shares a toast with U.S. Secretary of State Hillary Clinton and Vice President Joe Biden during a luncheon held in Merkel's honor at the State Department in Washington June 7, 2011. REUTERS/Stelios Varias

Germany’s Federal Intelligence Service (BND) recorded a conversation of Hillary Clinton while she was secretary of state, three German media outlets reported on Friday. Clinton was recorded while flying in a U.S. government aircraft. Reports did not specify the exact date of the recording.

Germany’s largest daily newspaper and two public broadcasting services broke the story on the alleged incident and cited anonymous government sources that said the recording was by accident. One source said the recordings should have been destroyed immediately and it was “idiocy” that they weren’t. The report also mentions the BND recorded other “American politicians and other friendly countries,” but did not specify which politicians or what countries.

The disclosure came after last year’s revelation by Edward Snowden that the U.S. ran an espionage operation on Germany, one of America’s closest allies. German Chancellor Angela Merkel, who was bugged and recorded by the U.S., was highly critical of the surveillance, saying there must not be “spying among friends.” More recently, German officials revealed in July that the U.S had been working with a spy in Germany for more than two years.

Snowden, a former U.S. government defense contractor for the National Security Agency (NSA) and s now globally recognized whistleblower, leaked the information on the U.S. government’s massive global espionage ring in October 2013. Documents leaked by Snowden indicate the U.S. had 122 world leaders in their sights at one point during his employment at the NSA.