Banking giant Capital One confirmed last night that it was targeted by a cyber-attack that disrupted online services.
An Iranian group calling itself Izz ad-Din al-Quassam Cyber Fighters has claimed responsibility for the denial of service attack, which in previous weeks has aimed its virtual crosshairs at Wells Fargo, Citigroup, J.P. Morgan and Bank of America.
The group claims the denial of service attack on the bank's customer-facing systems was in response to a YouTube video ridiculing the Muslim prophet Muhammad, reports Bloomberg.
CNBC, which first reported the news, confirmed with a spokesperson that the bank's "other systems were not affected by the denial of services attack."
The bank said it has "no reason to believe" that customer data or account details is "at risk" or stolen during the online attack.
While denial of service attacks are a commonplace form of online protest, Bloomberg said that there was a unique nature of these attacks. Dubbed as "sophisticated," banks are attempting to understand the architecture of the attacks in a bid to mitigate any damage caused in the future.