(CBS/AP) NEW YORK - The FBI is now investigating the cyber attack against Sony that compromised millions of PlayStation Network customers' personal information.
"The Sony matter is under active investigation. It involves personnel from the FBI and the Justice Department who are looking into the matter," U.S. Attorney General Eric Holder told Reuters. "It is something we are taking extremely seriously."
Sony said Monday that hackers may have taken personal information from an additional 24.6 million user accounts on the Sony Online Entertainment network. This data breach came on top of the 77 million PlayStation Network accounts Sony has already said were jeopardized by a malicious intrusion.
The latest incident occurred April 16 and 17 - earlier than the PlayStation break-in, which occurred from April 17 to 19, according to Sony.
According to Sony, credit card information may have been compromised in the PlayStation Network intrusion. Various pieces of personal information may have been taken in the Sony Online Entertainment breach, and a relatively small number of credit card numbers belonging to overseas customers may have been accessed.
The company said it will grant players 30 days of additional time on their subscriptions, along with one day for each day the system is down.