SCOTTSDALE, Ariz. – Restaurant chain P.F. Chang’s China Bistro announced that it is investigating claims of a data breach involving credit and debit card data reportedly stolen from locations nationwide.

According to an initial report on the website KrebsOnSecurity, on June 9, thousands of newly-stolen credit and debit cards went up for sale on an underground store best known for selling tens of millions of cards stolen in the Target breach. Several banks contacted by Krebs said they acquired from this new batch multiple cards that were previously issued to customers, and found that all had been used at P.F. Chang’s locations between the beginning of March 2014 and May 19, 2014.

Contacted about the banks’ claims, the Scottsdale, Arizona-based restaurant chain said it has not yet been able to confirm a card breach, but that the company “has been in communications with law enforcement authorities and banks to investigate the source.”

It is still unclear how many of P.F. Chang’s 200-plus locations may have been impacted. According to the Krebs report, banks reported cards apparently stolen from restaurant locations in Florida, Maryland, New Jersey, Pennsylvania, Nevada and North Carolina.

Read more about data security in the May issue of NACS Magazine and the NACS Daily article, “Data Security: Enough is Enough.”