French presidential candidate Emmanuel Macron's campaign said on Friday it had been the target of a "massive" computer hack that dumped its campaign mails online 1-1/2 days before voters go to the polls to choose between the centrist and his far-right rival Marine Le Pen.
Some nine gigabytes of data were posted by a user called EMLEAKS to Pastebin, a document-sharing site that allows anonymous posting. It was not immediately clear who was responsible for posting the data or if any of it was genuine.
In a statement, Macron's political movement En Marche! (Onwards!) confirmed that it had been hacked.
"The En Marche! Movement has been the victim of a massive and co-ordinated hack this evening which has given rise to the diffusion on social media of various internal information," the statement said.
In its statement on Friday, En Marche! said that the documents released online showed only the normal functionings of a presidential campaign, but that authentic documents had been mixed on social media with fake ones to sow "doubt and misinformation."
"The seriousness of this event is certain and we shall not tolerate that the vital interests of democracy be put at risk," it added.
France's Interior Ministry will not comment on the reported email hacking, a spokesman said on Friday.
"Neither the ministry, nor any other ministry would be commenting on this because according to the law, campaigning has ended as of midnight," the spokesman said.