After adding an additional 2.5 million American victims, the company has now revealed that the data of over 15.2 million United Kingdom customers has also been stolen.
Equifax has now revealed that out of 15.2 million consumers, almost 700,000 have had their personal data stolen that included their usernames, passwords, driving license numbers, and partial credit card details.
Reuters reports that 14.5 million of the 15.2 million exposed records did not contain sensitive information. The company initially said that 143 million USA consumers had their Social Security numbers, birth dates and other personal information accessed, raising that estimate to 145.5 million last week. However, it said that in 15,000 cases it included information such as passwords and partial credit-card details.
It added: "We will need to contact 693,665 consumers by post".
Consumers who had a phone number accessed will be offered a leading identity monitoring service for free.
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Still, 55 percent of respondents haven't yet checked to see if they were affected by the Equifax breach, and just 26.48 percent said they would join a class action lawsuit against Equifax in response to the breach.
As Equifax previously announced, the United Kingdom records were exposed in the breach of computers at Equifax's USA headquarters due to a "process failure" between 2011 and 2016 that resulted in their storage in the US. It had also earlier claimed that no passwords or financial information was stolen during the breach making identity theft an unlikely outcome.
"If you have been told by Equifax that security details from your Equifax.co.uk membership account - such as password and secret questions - have been accessed, you should ensure those details are not used on any other accounts", it said in a statement.
United Kingdom customers can phone Equifax for advice on 0800 587 1584.