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JPMorgan Chase took to Twitter on Monday afternoon to tell customers its website was "experiencing intermittent issues" and to recommend customers use its mobile service while the company worked it out.
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American Express endured a cyberattack on Thursday that left some customers unable to access their accounts.
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Though JPMorgan Chase and BB&T are the only big banks to confirm a denial of service attack on Tuesday, roughly a half dozen institutions endured digital assaults at around the same time, according to the security firm Radware.
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A group that has claimed responsibility for a flood of cyberattacks on the nation's biggest banks says it was behind an
The al-Qassam Cyber Fighters, hacktivists who since September have waged a campaign to impede online operations at financial institutions until YouTube takes down a trailer for an anti-Muslim film, said in an email Tuesday it targeted Amex in the past week along with five other firms: Bank of America (BAC), Citizens Financial (RBS), KeyCorp (KEY), BB&T (BBT) and Ameriprise (AMP).
Amex spokeswoman Amelia Woltering tells American Banker the company has not been hit by another denial of service attack since Thursday and is “working with law enforcement authorities” to investigate the incident.
At least two other institutions the al-Qassam group targeted experienced some disruptions.
BB&T spokesman Brian Davis said in an email the company incurred "intermittent delays and outages on BBT.com for a few hours [Tuesday] due to a targeted cyber event." Lynn Woodman, a spokeswoman for KeyCorp, said the company's websites last week experienced "some activity but with minimal disruption." "We're dealing with this as a new normal," she added.
Spokespeople for B of A, Citizens Financial and Ameriprise Financial did not respond immediately to a request for comment.
The attack on Amex, which took the company's website offline for roughly two hours, followed similar attacks recently on
JPMorgan Chase (JPM) experienced an
For its part, YouTube has said the trailer conforms to the company's