The FBI is investigating a hacking attack on JPMorgan Chase and at least one other bank, according to reports.
A report on Bloomberg.com said on Wednesday the FBI is investigating an incident in which Russian hackers attacked the US financial system earlier this month in possible retaliation against US government-sponsored sanctions aimed at Russia.
The attack, Bloomberg said, led to the loss of sensitive data. Bloomberg cited security experts saying that the attack appeared "far beyond the capability of ordinary criminal hackers".
In a statement, JPMorgan spokeswoman Trish Wexler said companies "of our size unfortunately experience cyber attacks nearly every day. We have multiple, layers of defence to counteract any threats and constantly monitor fraud levels."
Wexler did not confirm the reports and the FBI declined to comment.
The Wall Street Journal also cited unnamed sources in a less detailed report that called the attacks a "significant breach of corporate computer security".
JPMorgan is the largest US bank by assets.
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