Bloomberg said two people familiar with the probe confirmed that the Federal Bureau of Investigation (FBI) was examining the case to see if it is retaliation for US sanctions against Moscow over its support of Ukraine's secessionist rebels.
Bloomberg and The Wall Street Journal, which also reported the hacking case but without naming Russians as being behind it, said it was not clear what damage the hackers caused or what data they may have stolen.
Bloomberg said the hackers showed a high level of skill to get through layers of security in the bank's systems, a feat several security experts said appeared far beyond the capability of ordinary criminal hackers.
It said investigators, who also include the National Security Agency, are also studying whether the attack may have come from criminals in Russia or eastern Europe.
They are also examining whether the online break-in is related to similar incidents involving European banks.
The FBI said they were investigating the reports without confirming details at this point.
"We are working with the United States Secret Service to determine the scope of recently reported cyber-attacks against several American financial institutions," said FBI spokesman J. Peter Donald in New York.
"Combating cyber threats and criminals remains a top priority for the United States Government, and we are constantly working with American companies to fight cyber-attacks."
A JPMorgan spokesman did not confirm the specific case, but said in a statement that "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," the spokesman
A source familiar with the matter said the bank regularly informs law enforcement agencies when it sees suspicious activity.
"A critical part of our response is monitoring for fraud," the source said, adding that the bank was not seeing any increased activity at this time.
Source: AFP via I-Net Bridge
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