The FBI Wednesday was investigating one of the largest credit card hacking incidents in American history. Eight million Visa, MasterCard and, to a lesser extent, American Express customers are said to be affected. So far, there are no reports the accessed numbers have been used to buy anything. The numbers actually were accessed from a third-party company that processes the numbers for retailers. Though neither the credit card companies nor the FBI were saying much about the hacking Wednesday, the companies were quick to assure customers they would not be held responsible for illegal purchases. VISA issued a statement a statement of reassurance Tuesday. Full Story