Security researchers say hackers claiming to have credit card information stolen from Sony's PlayStation Network last week are trying to sell them on underground Internet forums, but the veracity of the claims could not be confirmed.

Sony warned its more than 70 million customers on Tuesday that their personal information, including customer names, addresses, e-mail addresses, birthdays, network passwords, and user names, as well as online user handles, was obtained illegally by an "unauthorized person." Sony responded to the intrusion, which occurred between April 17 and 19, by temporarily disabling PSN and Qriocity, its subscription music service, and contracting with an outside security firm to investigate the intrusion on its network.

"While there is no evidence at this time that credit card data was taken, we cannot rule out the possibility," a company spokesman wrote Tuesday. Sony said in an FAQ posted today that the credit card data was encrypted and reiterated that it had no evidence the data was stolen.

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