The $2.2 billion RedwoodCredit Union said Friday it has reissued 18,400 debit cardssince June when the Santa Rosa, Calif., credit union was notifiedthat a regional supermarket's IT system had been hacked bycriminals compromising about 200 member accounts.

Raley's Family of Fine Stores announced on June 6 that a portionof its computer network systems may have been the target of acomplex, criminal cyber attack.

The company, which operates 128 supermarkets in northernCalifornia and northern Nevada, initiated an investigation todetermine whether cyber criminals may have obtained customer creditand debit card information.

Raley's has not confirmed any unauthorized access to paymentcard data and said on its website that it does not believe thatdebit PINs could have been accessed by the cyber criminals.

“We have zero fraud liability so our members carrying our cardswill not incur any loss even if there was fraud committed on theiraccounts,” added Robin McKenzie, senior vice president of marketing andcommunications for Redwood CU. “Our members have responded verypositively to our response to the situation.”

The hacking incident also affected the $106 million Members1^st Credit Union in Redding, Calif., and the $39 millionDow Great Western Credit Union in Antioch, Calif.

In a statement to members on its website, the 1^stCredit Union reported on July 1that it discovered some instances offraudulent charges due to the cyber attack at Raley's.

Though Members 1^st CU said it blocked India, thecountry identified as the origin of the fraudulent charges, itasked members to check their statements for any suspicioustransactions.

Ken Graves, CFO for Dow Great Western CU, said only two debitcards had been compromised as a result of the Raley's cyberattack.