NEW YORK - Target says up to 40 million card accounts may have been affected by a recent data breach.
This comes after the Secret Service announced Wednesday they were investigating a credit- and debit-card data theft at Target stores.
Secret Service spokesman Brian Leary confirms the agency is investigating, but declined to provide further details.
Customers who used a credit or debit card at Target between Nov. 27 and Dec. 15 may have been hacked, CNN reported.
Minneapolis-based Target Corp. did not respond to requests for comment. A MasterCard representative referred questions to Target.
Target has 1,797 stores in the U.S. and 124 in Canada.
Paul Hartwick, spokesman for Chase Bank, one of the largest U.S. credit card issuers, helped break down what to do if your credit or debit card has been affected.