Some nine gigabytes of data were posted by a user called EMLEAKS to Pastebin

Leading French presidential candidate Emmanuel Macron’s campaign said on Friday it had been the target of a “massive” computer hack that dumped its campaign emails online 1-1/2 days before voters choose between the centrist and his far-right rival Marine Le Pen.

Macron, who extended his lead in the polls over Le Pen on Friday, is seen as the frontrunner in an election billed as the most important in France in decades.

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.