BOSTON (Reuters) - Some of Citigroup Inc's
Bank spokesman Andrew Brent said the outage also affected applications for mobile devices such as the iPad, but that all sites and apps had been restored to service.
It was not clear what caused the problem, which occurred after the New York-based bank moved some of its operations to backup facilities. Its lower Manhattan buildings used for trading and investment banking were closed on Wednesday as the city struggled to recover from the historic storm.
Brent declined to say if the outage was caused by fallout from Sandy or other issues.
Citi, Bank of America Corp
The industry kept that campaign a secret until last month after a group that calls itself the Cyber Fighters of Izz ad-din Al Qassam began claiming credit for a spree of high-profile attacks that caused temporary outages at major U.S. banks.
The hackers behind the attacks have used sophisticated and diverse tools that point to a carefully coordinated campaign, security researchers have told Reuters.
(Reporting by Jim Finkle in Boston; Additional reporting by Rick Rothacker and David Henry in New York; Editing by Tim Dobbyn and Dan Grebler)