The company learned about the security breach on Tuesday from the U.S. Secret Service and began investigating the breach with the agency and a team of forensics experts.
While it knows that customers were exposed, it doesn't know how many, when it happened, or which restaurants were affected.
The company is working with credit card companies to determine which cards may have been affected.
For now, the company is asking customers to monitor their credit and bank accounts and report any fraudulent activity to their card companies. It also launched a website, pfchangs.com/security , to keep people updated on the investigation and answer questions.
A wave of data breaches at other major U.S. corporations is putting consumes on alert and raising awareness about how vulnerable the system is.
Late last year, thieves stole 40 million credit and debit card numbers from customers shopping at
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