P.F. Chang’s China Bistro Inc. said credit- and debit-card data has been stolen from some of its restaurants and that it is probing the incident with the U.S. Secret Service and a team of third-party investigators.

All of the chain’s Asian-themed restaurants in the continental U.S. will now use a manual credit-card imprinting system, the Scottsdale, Arizona-based company said today in an e-mailed statement. An independent journalist who investigates hacker attacks reported earlier this week that card data stolen from P.F. Chang’s had gone on sale on an underground Web marketplace, and the company said it was looking into the matter.

The restaurant chain, which was acquired by private-equity firm Centerbridge Partners LP for $1.05 billion in 2012, joins Target Corp. and Neiman Marcus Group Ltd. in being hit by hackers.

P.F. Chang’s, which also runs the Pei Wei Asian Diner chain, is facing other headaches beyond the breach. Moody’s Investors Service downgraded its credit rating earlier this month, citing “soft consumer spending and intense competitive pressure.”