Citigroup reported that the security breach compromised a total of 360,083 North America Citi-branded credit cards. Even though this number represents roughly one percent of its US clientele, the company has taken the required measures in order to prevent possible consequences of the hacking.
“Citi has implemented enhanced procedures to prevent a recurrence of this type of event. We have also notified law enforcement and government officials,” the banking group said in a statement to “our customers.”
“We continue to monitor customer service and communication channels and take every necessary action to ensure our customers are cared for.”
As further investigations are taking place, further details about the breach were declined by the company.
The company has come under scrutiny from US lawmakers for its handling of the attack as Citi waited almost a month before informing its clients of the May 10 attack.
Citi replaced the cards of 217,657 customer accounts.
Citi is one of the world’s largest providers of credit cards, with more than 21 million accounts and is owed more than $77 billion in North America, according to its 2010 annual report.