Data on up to 143 million Americans, about 400,000 Britons and a number of Canadians may have been stolen by hackers between mid-May and July. The chief information officer and chief security officer have both stood down. Equifax faces dozens of legal claims over the breach, which the US Federal Trade Commission is investigating. Social security numbers, birth dates, addresses and driving licence numbers for up to 143 million Americans were exposed, the Atlanta-based firm says. Credit card numbers for about 209,000 Americans and "certain dispute documents with personal identifying information" for some 182,000 Americans were also accessed by the hackers, it adds. Lenders use data amassed by firms like Equifax to assess the credit worthiness of customers seeking to acquire houses, cars and credit cards.