An interagency group of federal banking regulators has started investigating the incident. An old e-mail scam has reappeared in the hopes of tricking MasterCard customers into giving up their account information. Some banks are even declining to tell cardholders if their accounts were hacked. An Internet security firm, Secure Computing Corp., has warned that an old email scam has re-emerged in the hope of trickling MasterCard card customers into handing over their account details. Read more from the Washington Post here.”]