Russian hackers may have stolen account information from JPMorgan Chase and four other banks.
Checking and savings account information were reportedly stolen, but the number of accounts affected isn’t known.
Neither Chase, nor the FBI, confirmed the attack.
Companies “of our size unfortunately experience cyberattacks nearly every day,” JPMorgan spokeswoman Trish Wexler said in a statement. “We have multiple layers of defense to counteract any threats and constantly monitor fraud levels.”
Bloomberg.com said the FBI was investigating an incident in which hackers attacked the US financial system, in possible retaliation for US sanctions aimed at Russia.