(Bloomberg) -- Dow Jones, owner of the Wall Street Journal, said payment card and contact information belonging to fewer than 3,500 current and former subscribers may have been accessed, though it found no direct evidence that any information was stolen.

The media company owned by Rupert Murdoch’s News Corp. notified customers Friday in a letter that it “recently determined there was unauthorized access to our systems.”

Read: Scottrade reveals data breach

Dow Jones is working with law enforcement and a cybersecurity firm to investigate the incident, according to the letter signed by Dow Jones Chief Executive Officer William Lewis.

Read: Group marks Cyber Security month by revealing it was hacked

He said it was likely part of a broader campaign “involving a number of other victim companies” and aimed at collecting subscribers’ contact information to commit fraud.

“While we recognize that no company is immune to cyberattacks, we are committed to doing everything we can to protect our customers,” Lewis said.

Read: Health care companies at severe risk of cyberattack

Instant Insights /

Dow Jones says hackers may have accessed data of users

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