Sony said it has found no link between an attack on its PlayStation Network and Qriocity services and Internet activist group Anonymous, which had earlier targeted its systems.

The online gaming and entertainment services were taken offline on April 20 after a "very sophisticated" attack on Sony's data center in San Diego, said Kaz Hirai, CEO of Sony's games subsidiary, at a Tokyo news conference. They are due to return to service later this week.

Less than two weeks before the most recent attack, Anonymous members launched a denial of service attack against the PlayStation Network in protest at Sony's legal pursuit of hacker George Hotz. Hotz had modified the firmware of a PlayStation 3 so that it could run the Linux OS. Sony claimed the software violated the U.S. Digital Millennium Copyright Act, which prohibits the reverse-engineering of encryption protections.

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