"We have discovered that between April 17 and April 19, 2011, certain PlayStation Network and Qriocity service user account information was compromised in connection with an illegal and unauthorized intrusion into our network," .

It was still investigating the matter, but believes that the intruder obtained names and addresses for registered PlayStation Network and Qriocity users, along with their birthdates, e-mail addresses and other personal information.

"While there is no evidence at this time that credit card data was taken, we cannot rule out the possibility," Sony said. "If you have provided your credit card data through PlayStation Network or Qriocity, out of an abundance of caution we are advising you that your credit card number (excluding security code) and expiration date may have been obtained."

In response, the company said it has now turned off both of the services -- which weren't working anyway -- and hired a security firm to conduct "a full and complete investigation" into what happened.

It now expects to restore services "within a week," the blog post says.