The US's biggest bank JP Morgan has suffered a massive cyber attack on 76 million private, and seven million business, customers in the US.
The attack gathered account holders' names and addresses, but the bank said it did not involve critical information such as account and social security numbers.
Earlier this year there were reports that Russia had hacked into its systems, and in August the bank said it was co-operating with law enforcement officials over this suspected incident.
JP Morgan has spoken out after the event and says it is unlikely customers will need to take any action, such as changing their passwords or account information. The bank also added that the "customers whose accounts had been hacked are not liable for unauthorised transactions on their account that they promptly alert the firm to."
The spokeswoman for the company Patricia Wexler said the bank is not offering credit monitoring to customers because it does not believe any financial information, account data, or personally identifiable information was taken.
Other major US firms have also been the subject of similar wide scale attacks, including Home Depot and Target.
The Home Depot breach affected 56 million customer payment cards, while Target saw credit card data for 40 million customers stolen, as well as personal and identification information for 70 million other customers.
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