JPMorgan Chase said Thursday it is working with investigators after it and at least four other US banks were hit by computer hackers this month, according to a report.
The nation’s biggest bank said it is taking additional steps to protect sensitive data while investigators try to determine the scope of the breach, Bloomberg News reported, citing spokeswoman Patricia Wexler.
The bank, run by CEO Jamie Dimon, will contact customers who might have been affected, Wexler told Bloomberg in an e-mail.
Customers won’t be held liable for any fraud stemming from the attacks and should report suspicious activity, she said, adding that the bank hasn’t seen an unusual spike in fraud.
It’s unclear what, if any, information was lost or stolen as a result of the series of coordinated attacks that took place in mid-August.
The attacks may have been prompted by US sanctions against Russia over the Ukraine invasion, according to reports.
The FBI said it is working with the US Secret Service to probe media reports that financial firms were targeted by cyberhackers.
“We are working with the United States Secret Service to determine the scope of recently reported cyber attacks against several American financial institutions,” FBI spokesman Joshua Campbell said in a statement to Reuters.