Sears Looks for Possible Breach as Secret Service Said to Assist

Sears Holdings Corp., the retailer run by hedge fund manager Edward Lampert, is investigating a possible security breach after a series of cyberattacks on other retailers have exposed the data of millions of consumers.

The security review is still at an early stage as Verizon Communications Inc.’s digital forensics unit and the U.S. Secret Service sift through the company’s computer data to look for traces of hackers and the extent of any incursion, according to two people familiar with the matter.