A MasterCard security official said his company believed it had around 29 million compromised cards. TJX spokeswoman Sherry Lang told reporters that the retailers is sticking with its figure of 45.7 million accounts exposed. The retailer originally revealed on 17 January that the computer system it uses to process and store information related to customer transactions had been hacked, potentially exposing millions of customers' credit and debit card numbers, as well as driver's licence information. Hackers placed unauthorised software on TJX's computer network and stole at least 100 files containing data on millions of accounts from systems in Framingham, Massachusetts and Watford in the UK. Debit and credit card data exposed in the compromise is thought to have been used to make fraudulent purchases in Florida, Georgia and Louisiana in the US, as well as in Hong Kong and Sweden.