Germany's foreign intelligence agency eavesdropped on calls made by US Secretary of State John Kerry and his predecessor Hillary Clinton, German magazine Der Spiegel has reported.
The weekly magazine reported that the agency, known by its German acronym BND, taped a satellite phone conversation Mr Kerry made in 2013 as part of its surveillance of telecommunications in the Middle East. The agency also recorded a conversation between Ms Clinton and former UN Secretary-General Kofi Annan a year earlier.
The magazine did not give a source for its information, but said the calls were collected accidentally and the recordings were ordered destroyed immediately.
In Ms Clinton's case, the call reportedly took place on the same "frequency" as a terror suspect.
If true, the revelations would be embarrassing for the German government, which has spent months complaining to Washington about alleged American spy activity in Germany.
Last year, German media reports based on documents leaked by former NSA contractor Edward Snowden prompted a sharp rebuke from Chancellor Angela Merkel, who was allegedly among the US intelligence agency's targets.