A PNC spokesman on Friday said the bank's systems were operating normally. Spokespersons for Bank of America Corp, JPMorgan Chase & Co and U.S. Bancorp declined to comment. Citigroup Inc could not be immediately reached.
In its alert on Friday, the U.S. Office of the Comptroller of the Currency, which regulates national banks and thrifts, said groups launching denial of service attacks had varying motives, from gaining public attention to diverting the attention of banks while launching simultaneous attacks to commit fraud or steal proprietary information.
"Banks need to have a heightened sense of awareness regarding these attacks and employ appropriate resources to identify and mitigate the associated risks," the alert said.
Banks should have sufficient staffing during attacks, work with third-party providers and share information with other banks, the OCC said.
Of five major banks, Wells Fargo on Friday had spurred the most complaints from users about access problems, according to the Web site SiteDown.co, which tracks customer reports. It listed 576 "downtime reports" in the past 24 hours.
Wells Fargo says it has 21 million active online banking customers.
(Reporting By Rick Rothacker in Charlotte, N.C.; Editing by Gerald E. McCormick)
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