"Sony will not contact you in any way, including by email, asking for your credit card number, social security number or other personally identifiable information," the company said. "If you are asked for this information, you can be confident Sony is not the entity asking."

When the services come back up, users should change their logins and passwords, which Sony said were also stolen.

"We thank you for your patience as we complete our investigation of this incident, and we regret any inconvenience," Sony said. "Our teams are working around the clock on this, and services will be restored as soon as possible."