on january 17, 2007, tjx announced that it was the victim of an unauthorized computer systems intrusion. it discovered in mid-december 2006 that its computer systems were compromised and customer data was stolen. the hackers accessed a system that stores data on credit card, debit card, check, and merchandise return transactions. the intrusion was kept confidential as requested by law enforcement. tjx said that it is working with general dynamics, ibm and deloitte to upgrade computer security.