(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.”

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. 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. The company said that the number of customers whose contact data only may have been accessed is unknown.

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

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Dow Jones says hackers may have accessed data of 3,500 users

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