KONFRONTASI - JP Morgan Chase Co., the largest bank in the United States by assets, says a data breach has affected the data of 76 million households and 7 million businesses this summer.
Hackers attacked JP Morgan's computer systems between mid-June and mid-August.
The bank said on Thursday that information of customers including names, addresses, phone numbers and email addresses were stolen.
It added that there was no evidence that "account numbers, passwords, user IDs, dates of birth or Social Security numbers" were taken.
The revelation shows that the attack was far bigger than earlier estimates that about one million customers had been affected.
The breach is under investigation by the Federal Bureau of Investigation.
The bank continues to work closely with law enforcement to determine the roots of the cyber attack.
Cyber attacks have become more common during the past years.
Home Depot Inc. announced that its payment systems were breached in an attack in September and some estimated impacted about 56 million payment cards.
In another attack, Adobe Systems Inc. also said 100 million usernames, encrypted passwords and password hints were stolen about one year ago.
Target Corp.'s attack last summer targeted some 40 million payment cards and 70 million names, addresses, emails and telephone numbers.[presstv]