The chain restaurant P.F. Chang's said Monday that some customers' debit card and credit card information might have been stolen. The hacking may have occurred at 33 of the chain's restaurants across the country, according to CNNMoney.

 The West Des Moines P.F. Chang's restaurant was not on the list of 33 suspect restaurants, but other Midwest restaurants were. 

The Chinese-themed restaurant chain first found out about the possible theft on June 10, when it was alerted to it by the Secret Service. That was just days after cybersecurity journalist Brian Krebs claimed that thousands of credit card and debit card numbers that appeared to have been stolen from P.F. Chang's restaurants earlier this year had gone up for sale.

Some of the incidents may have occurred as back as October 2013, according to a company statement issued today. The company advised customers who used their cards at those times to monitor their accounts for potential theft.

 It also said today that the security compromise has been "contained" and that any credit or debit transaction at the chain after June 11 of this year has been processed securely. 

The company said its Pei Wei Asian Diner chain of restaurants was not affected.