An estimated 143 million U.S. consumers could be affected by a cybersecurity attack carried out by suspected criminal hackers, national credit-reporting company Equifax said Thursday.

The unauthorized access to information for nearly 44% of the U.S. population occurred from mid-May through July 2017 and primarily involved names, Social Security numbers, birth dates, addresses and, in some cases, driver’s license numbers, the company said in a detailed announcement of the attack.

Additionally, the hackers gained access to credit card numbers for roughly 209,000 consumers, plus certain dispute documents with personal identifying information for approximately 182,000 consumers.

Equifax also identified unauthorized access to limited personal information for certain United Kingdom, and Canadian residents.

However, there was no evidence of unauthorized activity on Equifax’s core consumer or commercial credit reporting databases, the company said.

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