US retail giant Home Depot says hackers who stole payment card details of millions of customers also stole 53 million email addresses.
It was reported that hackers accessed the network with a vendor's username and password between April and September.
Home Depot had previously revealed 56 million debit and credit card details were stolen in the hack and the firm insisted that the file containing the email addresses did not contain passwords or other sensitive personal information.
Home Depot warned customers to be on guard against further phishing scams that might trick them into sharing personal information.
The company said customers that have been affected in the US and Canada will be offered credit monitoring.
Home Depot is still investigating the incident as analysts say it is one of the largest data breaches on record.
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