NEW YORK - Barnes & Noble Inc. said Tuesday that devices used by customers to swipe credit and debit cards have been tampered with in 63 of its stores in nine states.
The company warned customers to check for unauthorized transactions and to change their personal identification numbers, or PINs. It didn't say how many accounts may have been compromised.
But The New York Times, citing a high-ranking company official it did not name, reported that hackers had made unauthorized purchases on some customer credit cards.
The New York-based bookseller said in a statement Tuesday only one of the devices, known as PIN pads, was tampered with in each of the 63 stores. The stores are in California, Connecticut, Florida, Illinois, Massachusetts, New Jersey, New York, Pennsylvania and Rhode Island.
All the PIN pads in its nearly 700 stores nationwide were disconnected on Sept. 14 after the company learned of the tampering. Federal authorities are helping in its investigation.
Barnes & Noble said it is working with banks and card issuers to identify compromised accounts so that additional fraud-protection measures can be taken.
Customers at its book stores will now have to ask cashiers to swipe credit or debit cards on card readers connected to cash registers, a process that is secure, Barnes & Noble said.
Anything bought on Barnes & Noble.com or with the chain's Nook devices and app were not affected, the company said. It also said its customer database is secure.
Barnes & Noble is only the latest major retailer to be a victim of a serious data breach. In one of the largest, more than 45 million credit and debit cards were exposed to possible fraud because of hackers who broke into the computer system of TJX Cos., the parent company of retailers T.J. Maxx and Marshall's, starting in 2005.
LIST OF AFFECTED STORES
4735 Commons Way, Calabasas, Calif.
2470 Tuscany St. Suite 101, Corona, Calif.
2015 Birch Road Suite 700, Chula Vista, Calif.
313 Corte Madera Town Center, Corte Madera, Calif.
5604 Bay St., Emeryville, Calif.
810 West Valley Parkway, Escondido, Calif.
1315 E. Gladstone St., Glendora, Calif.
5183 Montclair Plaza Lane, Montclair, Calif.
894 Marsh St. Building G, San Luis Obispo, Calif.
2615 Vista Way, Oceanside, Calif.
72-840 Highway 111 Suite 425, Palm Desert, Calif.
27460 Lugonia Ave., Redlands, Calif.
1150 El Camino Real Space 277, San Bruno, Calif.
10775 Westview Parkway, San Diego, Calif.
3600 Stevens Creek Blvd, San Jose, Calif.
11 West Hillsdale Blvd., San Mateo, Calif.
9938 Mission Gorge Road, Santee, Calif.
40570 Winchester Road, Temecula, Calif.
4820 Telephone Road, Ventura Calif.
1149 S. Main St., Walnut Creek Calif.
470 Universal Drive North, North Haven, Conn.
100 Greyrock Place Suite H009, Stamford, Conn.
60 Isham Road W., Hartford, Conn.
18711 NE Biscayne Blvd., Aventura, Fla.
333 N. Congress Ave., Boynton Beach Fla.
152 Miracle Mile, Coral Gables, Fla.
1900 W. International Speedway, Daytona Beach, Fla.
2051 N. Federal Highway, Fort Lauderdale, Fla.
12405 N. Kendall Drive, Miami, Fla.
11380 Legacy Ave., Palm Beach Gardens, Fla.
14572 SW 5th St. Suite 10140, Pembroke Pines, Fla.
11820 Pines Blvd., Pembroke Pines Fla.
5701 Sunset Drive Suite 196, S. Miami Fla.
700 Rosemary Ave. Unit #104, West Palm Beach, Fla.
1441 West Webster Ave., Chicago, Ill.
1130 North State St., Chicago, Ill.
5380 Route 14, Crystal Lake, Ill.
20600 North Rand Road, Deer Park, Ill.
728 North Waukegan Road, Deerfield, Ill.
1630 Sherman Ave., Evanston, Ill.
1468 Springhill Mall Blvd. West, Dundee, Ill.
170 Boylston St., Chestnut Hill, Mass.
96 Derby Street Suite 300, Hingham Mass.
82 Providence Highway East, Walpole, Mass.
395 Route 3 East, Clifton, N.J.
55 Parsonage Road, Edison, N.J.
2134 State Highway, 35 Holmdel, N.J.
4831 US Highway 9, Howell, N.J.
23-80 Bell Blvd., Bayside, N.Y.
176-60 Union Turnpike, Fresh Meadows, N.Y.
1542 Northern Blvd., Manhasset, N.Y.
160 E 54th St. (Citicorp), New York, N.Y.
2289 Broadway, New York, N.Y.
33 East 17th St. (Union Square), New York, N.Y.
555 Fifth Ave., New York N.Y.
2245 Richmond Ave., Staten Island, N.Y.
230 Main St., White Plains, N.Y.
97 Warren St., New York, N.Y.
100 West Bridge St., Homestead, Pa.
800 Settlers Ridge Center Drive, Pittsburgh, Pa.
1311 West Main Road, Middleton, R.I.
371 Putnam Pike Suite 330, Smithfield, R.I.
1350-B Bald Hill Road, Warwick, R.I.