In a recent cyber attack by LulzSec, while earlier Citigroup officials claimed that 200,000 creditcards were compromised. This time around they claim that infact 360,000 credit cards have been compromised and the information has been stolen by LulzSec.
[quote]Hackers gained access to a total of “360,083 North America Citi-branded credit cards.Hackers gained access to a total of “360,083 North America Citi-branded credit cards.[/quote]
The bank also claims that more than 70% of the credit cards have already been replaced, and that the maximum Credit Cards were from California.
LulzSec the infamous hacking group behind many recent cyber attacks, including various at Sony, Has not yet mentioned any involvement in the case.