WikiLeaks has published documents it says shows the US National Security Agency (NSA) eavesdropped on the last three French presidents.
There was no immediate confirmation of the accuracy of the documents released by French daily newspaper Liberation and investigative website Mediapart.
WikiLeaks spokesman Kristinn Hrafnsson said he was confident the documents were authentic, noting that WikiLeaks' previous mass disclosures have proven to be accurate.
Allies have long spied on each other as well as sharing intelligence.
There was no immediate comment from the White House or the offices of French President Francois Hollande or his predecessors, Nicolas Sarkozy and Jacques Chirac, reportedly targeted by the eavesdropping.
European allies were indignant at Edward Snowden's earlier revelations of widespread NSA surveillance of national leaders.