Dow Jones & Co. disclosed a data breach affecting 3,500 people in a letter to customers on Friday. Scottrade Inc. reported a similar data breach last week that affected 4.6 million investors. Investigators feel that the focus of the attack was the contact information of current and former Dow Jones subscribers, such as names, addresses, email addresses, and phone numbers. The attack appears to be part of a larger campaign involving “a number of other victim companies,” the CEO of Dow Jones says.”]

