User contact information of approximately 76 million households and 7 million small businesses were compromised during a concentrated cyber attack this summer, U.S.’s biggest bank, JPMorgan Chase said Thursday.

 “There is no evidence that account information for customers – account numbers, passwords, user IDs, dates of birth or Social Security numbers – was compromised during this attack,” the bank said in a securities filing.

The information compromised consisted only of the “name, address, phone number and email address – and internal JPMorgan Chase information relating to such users,” the bank said.  In an additional statement made by a spokesperson, the bank admitted that hackers also tapped into internal data identifying customers by category, such as whether they are clients of the private-bank, mortgage, auto or credit-card divisions.

The attack was discovered in mid-August, but the number of consumers affected appears to be much larger than predicted. There are 115,226,802  households in the U.S., according to U.S. Census statistics, and nearly 66 percent appear to have been affected by the breach.

The New York-based bank said that, as of this date, JPMorgan Chase has not seen any unusual customer fraud related to this incident. The bank confirmed that, should fraud occur, customers would not be held liable for such transactions so long as they alerted the bank to them promptly.

The Bank said it continues to monitor the situation vigilantly,  is continuing to investigate the matter, and “is cooperating fully with government agencies' investigations.”

Anadolu Agency