Anonymous Says It Knocked Citigroup Sites Offline

Hackers claiming to be members of the loose hacking collective Anonymous took credit for knocking the Citigroup and Citibank Web sites offline on Friday. At times the sites were only sporadically available, and some attempts to log into banking accounts were met with an error message.
Andrew Brent, a Citigroup spokesman, confirmed that Citigroup’s consumer site had experienced a temporary outage but said that Citigroup had been able to restore Web site operations within one hour and was continuing to monitor its systems.
“At no point were there data integrity issues or compromise of client account information,” Mr. Brent said in an interview. “We apologize for any inconvenience.”

Source:The NewYork Times