Transcript for French presidential candidate Emmanuel Macron's campaign targeted by hackers

We turn to the developing political story overseas. An eerie he can Cho of the presidential campaign on the eve of what might be the most important election in France. We're learning of a huge hack and ABC's Jennifer Eccleston is on the story from London. Jennifer, good morning. Reporter: Good morning, Dan. Centrist presidential candidate Emmanuel macron's campaign calling the document dump a massive and coordinated hack. Some 9 gigabytes of data, e-mails and other election-related documents stolen from campaign accounts and posted by an anonymous user. Macron's campaign calling it a mix of genuine and fake docume documents, an effort they say to confuse voters before tomorrow's runoff against hard-line candidate marine LE pen. The timing of it just hours before the end to campaigning, both candidates are prevented by law from speaking about election issues this weekend. The French media were also reminded by election officials to stay away from the leaks as it might influence voters. Earlier macron's team blamed Russian hackers for a previous leak. It suspects the Kremlin of wanting to help LE pen who supports a pro-moscow policy. A striking similarity to charges of Russian interference during the 2016 American elections. Paula. All eyes on France for that. Jennifer, thank you for your reporting.

This transcript has been automatically generated and may not be 100% accurate.