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Scottsdale, AZ (WLTX) -- The Chinese restaurant chain P.F. Chang's China Bistro said Monday a security breach first reported in June may have led to the theft of customer data from certain credit and debit cards.

An intruder may have stolen card numbers and possibly names and expiration dates of customers's credit and debit cards used at 33 restaurants. But the chain has not determined that any specific card holders' data was stolen.

In Monday's statement the chain updated its progress in investigating a breach first reported in June.

PRESS RELEASE: List of the 33 restaurants involved

The security breach of their card processing systems occurred between October 19th of 2013, and June 11th of 2014, one day after the Secret Service made the company aware of the breach.

Federico went on to say the company initiated an internal investigation, to assess the breadth of the security breach, involving their card processing systems, and they have reason to believe the intruder may have stolen credit and debit card numbers, names, and expiration dates of some customer's cards.

The internal investigation, conducted by both P.F. Chang's staff and forensic data experts from a third party contracted for the investigation, determined the 33 locations, and specific date time frames the card processing system was compromised for each.

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