In a statement providing updated information on the security breach at several of its restaurants in the US discovered in June, P.F. Chang’s China Bistros confirms 33 locations whose payment processing systems have been compromised and the time frame the data is believed to have been stolen.News about the incident occurred on June 10, when the restaurant was alerted by the US Secret Service that a compromise of credit and debit card data may have occurred at some P.F. Chang’s locations in the …