According to this Gamasutra report, the Department of Homeland Security (DHS) is helping investigate the security breach of PlayStation Network that exposed millions of PSN users' personal data and credit card information to unauthorized intruders.
"The Department of Homeland Security is aware of the recent cyber intrusion to Sony's PlayStation Network and Qriocity music service," DHS spokesman Chris Ortman told government technology site NextGov. "DHS' U.S. Computer Emergency Readiness Team [CERT] is working with law enforcement, international partners and Sony to assess the situation."
Sony announced earlier this week that some PSN user data may have been stolen by unknown hackers earlier this month. They also said that credit card information may have been stolen. The FBI joined the investigation yesterday and 22 Attorneys-general have sent letters to Sony asking for answers.