Flickr minx 2012
Dow Jones, which publishes The Wall Street Journal, may have been hacked.
The FBI, the secret service, and the SEC have been investigating the hack for at least a year, according to the report.
Bloomberg said it wasn't clear if Dow Jones' news operations were targeted, but two of the people it cited said hackers sought information on stories being prepared.
The Wall Street Journal, Barron's and other Dow Jones publications often move shares of publicly listed stocks with scoops and analysis. Dow Jones is owned by Rupert Murdoch's Newscorp.
About a week ago, Dow Jones said that hackers had intruded, seeking contact and payment information for some 3,500 customers, according to the Bloomberg report.
It's not clear whether the new probe is related that.
Hacking Wall Street
Cyber security has been a big issue for Wall Street.
Back in August, Russian-speaking hackers and traders were accused of stealing more than 150,000 press releases from a handful of newswires with financial information that could be used for trading. That case involved PR Newswire, Marketwired, and Warren Buffet-owned Business Wire.
Another Wall Street bank, JPMorgan, is investing resources to amp up its own cybersecurity. That bank has hired more than 1,000 ex-military cybersecurity pros.
And retail brokerage Scottrade faced a cyberattack earlier this month. That attack affected up to 4.6 million clients and was aimed at stealing names and street addresses.
A Dow Jones spokesperson could not immediately be reached for comment. A spokesperson for the SEC declined to comment.
A spokesperson for the FBI told Business Insider they were aware of it and looking into it.