There has been a potential data breach at Shaw's Supermarket stores in Maine and 20 other states. Albertsons, the stores' parent company, says account numbers, expiration dates, cardholders' names and other information may have been stolen by hackers.

The company says there is not evidence that any cardholders' data was stolen or information misused. The time frame in question is between June 22 and July 17.

Albertsons promises, when more information is available, it will be posted at shaws.com.