The United States National Security Agency spied on French presidents Jacques Chirac, Nicolas Sarkozy and Francois Hollande, WikiLeaks said in a press statement published on Tuesday, citing top secret intelligence reports and technical documents.
The revelations were first reported in French daily Liberation and on news website Mediapart, which said the NSA spied on the presidents during a period of at least 2006 until May 2012, the month when Hollande took over from Sarkozy.
WikiLeaks said the documents derived from directly targeted NSA surveillance of the communications of Hollande (2012-present), Sarkozy (2007-2012) and Chirac (1995-2007), as well as French cabinet ministers and the French ambassador to the U.S.
The documents also contain the cell phone numbers of numerous officials in the Elysee presidential palace including the direct cell phone of the president, WikiLeaks said.
The documents include summaries of conversations between French government officials on the global financial crisis, the Greek debt crisis, and the relationship between the Hollande administration and the German government of Angela Merkel.
Former NSA employee Edward Snowden created an uproar in Germany after he revealed that Washington had carried out large-scale electronic espionage in Germany and claimed the NSA had bugged Merkel's phone.
"While the German disclosures focused on the isolated fact that senior officials were targeted by U.S. intelligence, WikiLeaks' publication today provides much greater insight into U.S. spying on its allies," WikiLeaks said.
This includes "the actual content of intelligence products deriving from the intercepts, showing how the U.S. spies on the phone calls of French leaders and ministers for political, economic and diplomatic intelligence".
The French president's office was not immediately reachable for comment.
WikiLeaks said French readers could "expect more timely and important revelations in the near future.
Last week, WikiLeaks published more than 60,000 diplomatic cables from Saudi Arabia and said on its website it would release half a million more in the coming weeks.